Well i dont have that issue. I use GSX2, also simmilar tweaks, PTA for shaders, and believe me, as max settings as i can force the system to...
I7 6700k GTX1070 32GB RAM, and all addons you can imagine...REX SKF, ASP4,(All from FSDT - OF-CO-UR-SE
).... and no blurries issues...
If you use P3DV4, try clicking "Delete Generated Files" inside P3DV4 root folder, and restart. I would save everything in Program data(Scenery.CFG) and APP data folders before(Exe.xml, dll.xml)...
It is interesting that issue came after the product install though
... Im scratching my head about how GSX could have interfere with blurries. Its a Dev-Coding thing may be? But if even unistalling is not returning to original state, well....
If doing this "Delete Generated Files" procedure solved your problem dont forget to share...