Hi Mark,
I have the same issues and a very similar system to you. I have been tweaking for a long time to prevent blurries around Concrete Municipal (ORBX PNW) with some success, but to totally prevent blurries I have to move the sliders back to a visually unacceptable position. PNW shares some aspects with photo real so I'd guess that your issues are similar to mine. I use the external frame rate limiter so my frames are set to unlimited in the cfg. I also have tried AA and Anisotropic off in game and enabled in Nvidia Inspector.
Here's my.cfg (with the gauges/permissions etc. removed, so maybe some of the settings might be useful?
// This file was tweaked on Jul 29, 2011 at 11:25 GMT using Bojote's automated FSX Tweaking & Tuning Service
// Your 'original' fsx.CFG file was backed up at
http://www.venetubo.com/fsx/6a6464b861ef764f9893ebdad2f3a242/backup/fsx_backup.cfg
// This file is optimized as follows: 4 core(s), CPU speed 3, HT 0, GPU 4, PREF 2
// You can visit Bojote's FSX Tweaking & Tuning service at
http://www.venetubo.com/fsx.html
[MAPVIEW_MAP]
SHOW_AIRPORTS=1
SHOW_AIRSPACE=1
SHOW_APPROACHES=1
SHOW_DATATAGS=1
SHOW_FLIGHTPLAN=1
SHOW_INTERSECTIONS=0
SHOW_JET=0
SHOW_NDBS=1
SHOW_TERRAIN=1
SHOW_VICTOR=0
SHOW_VORS=1
SHOW_WEATHERSTATIONS=1
SHOW_WEATHERSYSTEMS=1
show_flight_history=1
[BufferPools]
PoolSize=524288//8388608
RejectThreshold=262144//98304
UsePools=1
[VirtualCopilot]
VirtualCopilotActive=0
[SOUND]
AmbientUI=0
AmbientUIMusicVolume=-6.000000
PrimaryDevice={DEF00000-9C6D-47ED-AAF1-4DDA8F2B5C03}
SOUND=1
SOUND_LOD=1
SOUND_QUALITY=2
UISound=1
VoiceDevice={DEF00002-9C6D-47ED-AAF1-4DDA8F2B5C03}
[SlewTextInfo.1]
AirSpeed=1,5
Altitude=1,3
Heading=1,4
Latitude=1,1
Longitude=1,2
[AContain]
LabelColor=FFFF0000
LabelDelay=1000
ShowLabelAirline=0
ShowLabelAirlineAndFlightNumber=0
ShowLabelAirspeed=0
ShowLabelAltitude=1
ShowLabelContainerId=0
ShowLabelDistance=1
ShowLabelFlightPlan=0
ShowLabelHeading=0
ShowLabelManufacturer=1
ShowLabelModel=1
ShowLabelTailNumber=0
ShowLabels=0
ShowUserLabel=0
[ATC]
AutoOpenAirTrafficWindow=0
COMM_MSG_AI_ATC_COLOR=FFFF7840
COMM_MSG_ATC_AI_COLOR=FF00FF00
COMM_MSG_ATC_USER_COLOR=FFB6FFB6
COMM_MSG_NONE_COLOR=FFFFFFFF
COMM_MSG_USER_ATC_COLOR=FFFFD21B
PilotVoice=0
ShowATCText=0
UsePilotVoice=0
[TextInfo.1]
AirSpeed=1,5
Altitude=1,3
Heading=1,4
Latitude=1,1
Longitude=1,2
WindDirectionAndSpeed=1,6
[AccelerationPack]
ControlsFirstRun=0
HomePageFirstRun=0
[INTERNATIONAL]
ASLAT=2
ASLON=1
MEASURE=0
[CONTROLS]
Controls_Current=Standard
Controls_Default=Standard
KBDAIL=64
KBDELEV=64
KBDRUD=64
force_crash_enabled=0
force_gear_bump_enabled=0
force_ground_bumps_enabled=0
force_master_enabled=0
force_master_gain=10000
force_stick_force_enabled=0
force_stick_shaker_enabled=0
[FACILITIES]
CITY=
COUNTRY=
GTL_BUTTON=1414
STATE=
[TextInfo.3]
AirSpeed=1,5
Altitude=1,3
FrameRate=2,1
FuelPercentage=2,4
GForce=2,3
Heading=1,4
Latitude=1,1
LockedFrameRate=2,2
Longitude=1,2
WindDirectionAndSpeed=1,6
[PointOfInterestSystem]
CycleSetting=0
[GRAPHICS]
AC_SELF_SHADOW=1
AIRCRAFT_REFLECTIONS=1
AIRCRAFT_SHADOWS=1
ALLOW_SHADER_30=1
COCKPIT_HIGH_LOD=1
D3D10=0
EFFECTS_QUALITY=2
ForceFullScreenVSync=1
ForceWindowedVSync=1
GROUND_SHADOWS=0
HIGHMEMFIX=1
IMAGE_QUALITY=0
LANDING_LIGHTS=1
NUM_LIGHTS=8
See_Self=1
TEXTURE_MAX_LOAD=2048
TEXTURE_QUALITY=3
Text_Scroll=1
SHADER_CACHE_PRIMED_10=1693500672
SHADER_CACHE_PRIMED=1693500672
[TrafficManager]
AIRPORT_SCENERY_DENSITY=1
AirlineDensity=20
FreewayDensity=20
GADensity=20
IFROnly=0
LeisureBoatsDensity=20
ShipsAndFerriesDensity=20
[DynamicHeadMovement]
HeadMoveTimeConstant=1.000000
LonAccelOnHeadLon=-0.020000
LonAccelOnHeadPitch=-0.010000
MaxHeadAngle=5.000000
MaxHeadOffset=0.300000
RollAccelOnHeadLat=0.010000
RollAccelOnHeadRoll=0.100000
YawAccelOnHeadLat=-0.100000
[REALISM]
AllowEngineDamage=False
AutoCoord=False
AutoTrim=False
CrashDetection=False
CrashTolerance=0.000000
CrashWithDyn=False
GEffect=False
General=0.000000
GyroDrift=False
GyroEffect=0.000000
ManualLights=False
PFactor=0.000000
RealMixture=True
StressDamage=False
Torque=0.000000
TrueAirspeed=False
UnlimitedFuel=False
[Weather]
AdjustForMagVarInDialog=1
CLOUD_COVERAGE_DENSITY=8
CLOUD_DRAW_DISTANCE=3
DETAILED_CLOUDS=1
DisableTurbulence=0
DownloadWindsAloft=0
DynamicWeather=2
MaxGustRampSpeed=200
MaxGustTime=500
MaxVarRampSpeed=75
MaxVarTime=50
MinGustRampSpeed=1
MinGustTime=10
MinVarRampSpeed=10
MinVarTime=5
THERMAL_VISUALS=0
TurbulenceScale=1.000000
WeatherGraphDataInDialog=0
WeatherServerAddress=fs2k.zone.com
WeatherServerPort=80
WindshieldPrecipitationEffects=1
[Misc]
Com_Rate=7
[Main]
DisablePreload=1
FIBER_FRAME_TIME_FRACTION=0.75//0.50
HideMenuFullscreen=1
HideMenuNormal=0
Location=0,0,1280,620,\\.\DISPLAY1
Maximized=1
SimObjectPaths.0=SimObjects\Airplanes
SimObjectPaths.1=SimObjects\Rotorcraft
SimObjectPaths.2=SimObjects\GroundVehicles
SimObjectPaths.3=SimObjects\Boats
SimObjectPaths.4=SimObjects\Animals
SimObjectPaths.5=SimObjects\Misc
//SimObjectPaths.6=F:\Port-overs
User Objects=Airplane, Helicopter
ProcSpeed=9209
PerfBucket=7
//gauges, permissions etc.
[TextInfo.2]
FrameRate=1,1
FuelPercentage=1,4
GForce=1,3
LockedFrameRate=1,2
[USERINTERFACE]
DisplayFuelAsWeight=0
Map_Orientation=0
OpenATCOnCreate=0
PAUSE_ON_LOST_FOCUS=1
PROMPT_ON_EXIT=1
PageID=1
SHOW_MISSION_CAPTIONS=0
SITUATION=C:\Users\Roger\Documents\Flight Simulator X Files\Cessna at Concrete Municipal
SelectAircraftManufacturer=Curtiss
SelectAircraftPublisher=All
SelectAircraftType=All
ShowAllACPaintSchemes=1
[DISPLAY.Device.NVIDIA GeForce GTX 460.0]
Mode=1280x1024x32
[SIM]
SYSCLOCK=1
[Display]
ActiveWindowTitleBackGroundColor=0,28,140,64
ActiveWindowTitleTextColor=255,255,255
BLOOM_EFFECTS=0
ChangeTime=0.000000
InfoBrakesEnable=True
InfoLowerLeftBackGroundColor=255,0,0,128
InfoLowerLeftTextColor=255,255,255
InfoLowerRightBackGroundColor=255,0,0,128
InfoLowerRightTextColor=255,255,255
InfoOverspeedEnable=True
InfoParkingBrakesEnable=True
InfoPauseEnable=True
InfoSlewEnable=True
InfoStallEnable=True
InfoUpperRightBackGroundColor=0,0,0,0
InfoUpperRightTextColor=255,0,0
NonActiveWindowTitleBackGroundColor=24,33,87,64
NonActiveWindowTitleTextColor=255,255,255
SKINNED_ANIMATIONS=1
TEXTURE_BANDWIDTH_MULT=120
TextureMaxLoad=6
TransitionTime=0.000000
UPPER_FRAMERATE_LIMIT=0
WideViewAspect=False
[JOBSCHEDULER]
AffinityMask=14
[WeatherMap]
SHOW_AIRPORTS=0
SHOW_AIRSPACE=0
SHOW_APPROACHES=0
SHOW_DATATAGS=1
SHOW_FLIGHTPLAN=1
SHOW_INTERSECTIONS=0
SHOW_JET=0
SHOW_NDBS=0
SHOW_TERRAIN=1
SHOW_VICTOR=0
SHOW_VORS=0
SHOW_WEATHERSTATIONS=1
SHOW_WEATHERSYSTEMS=1
[SlewTextInfo.3]
AirSpeed=1,5
Altitude=1,3
FrameRate=2,1
Heading=1,4
Latitude=1,1
LockedFrameRate=2,2
Longitude=1,2
[PANELS]
DEFAULT_VIEW=0
IMAGE_QUALITY=1
PANEL_MASKING=1
PANEL_OPACITY=100
PANEL_STRETCHING=1
QUICKTIPS=1
UNITS_OF_MEASURE=0
[STARTUP]
DEMO=0
LoadWindow=1
SHOW_OPENING_SCREEN=1
STARTUP_DEMO=0
[SlewTextInfo.2]
FrameRate=1,1
LockedFrameRate=1,2
[TERRAIN]
AUTOGEN_DENSITY=2
DETAIL_TEXTURE=1
LOD_RADIUS=5.500000
MESH_COMPLEXITY=80
MESH_RESOLUTION=23
SWAP_WAIT_TIMEOUT=2
TEXTURE_RESOLUTION=28
WATER_EFFECTS=5
[SCENERY]
DAWN_DUSK_SMOOTHING=1
IMAGE_COMPLEXITY=3
LENSFLARE=0
MAX_ASYNC_BATCHING_JOBS=3
SmallPartRejectRadius=4.0
[FlightPlanMap]
LineWidth=2
SHOW_AIRPORTS=1
SHOW_VORS=1
SHOW_NDBS=1
SHOW_APPROACHES=1
SHOW_INTERSECTIONS=1
SHOW_VICTOR=0
SHOW_JET=0
SHOW_AIRSPACE=1
SHOW_FLIGHTPLAN=1
SHOW_WEATHERSTATIONS=1
SHOW_WEATHERSYSTEMS=1
SHOW_DATATAGS=1
SHOW_TERRAIN=1
show_waypoints=1
show_airways=1
show_markers=1
show_volume_boundaries=1
show_ac_twr=1
[MULTIPLAYER]
condAccoutPassword=0