Black ZR-1:
I would like to add something to what mil posted above for the next set of tests. If you notice ground textures are not sharp or are blurred, then tend to sharpen, please drop the frame lock to 22 and leave it there. If things remain sharp and smooth during the tests, leave at 24. I also wish to point out that when changes are made to the config file in FSX it can take a bit of flight time for things to stabilize which is why it is important to fly out, circle around and come back to land in the pattern he has suggested. You are not looking for instant perfection after a configuration file edit or slider change but a change for the better as the flight progresses. Returning and landing in the same area while looking for improvements or degenerated perfomance is where the suggestions come for changes to the settings.
I also want to point out that FSX has the ability to make subtle changes as you use it, as long as the configuration file and settings remains untouched. This is something you will notice more after some time of flying with the final settings. If any change is made to the settings it takes flight time for things to stabilize again.
NickN said if you see ground textures blur then sharpen back up, drop the frame lock to 22 and retest with the same fiber frame lock. See if ground textures are still a bit blured and if they are, if they sharpen faster. Or if it is the same. You may find they are no longer blured.
You said 'so far so good', I assume with the exception of the minor ground blur that means everything flew smooth? and looked good with the texture bandwidth now at 400 and the autogen numbers where we originally had them?
I think we are getting close to the point where hardware will need to be looked at but for the next test with the reduced frame lock of 22, drop the traffic. Set GA to 20 and Airline to 30 for this test.
If the ground textures have returned to a better state without being blured and everyhting looks and feels really good, raise the Airline traffic slider to 50, leave GA at 20 and retest.
If that checks out the same then I think we may be ready for some hardware analysis
One thing I noticed in the screen shots you posted. I see an autogen house and trees that looks like they inside the airfield at KSEA. That is strange and does not look right. I do not show a autogen house or trees in my KSEA, runway 34L. I am wondering why that is in the scene on your system.