@Masscot have you contemplated a new video card?
I run a GTX 1070 and I swear I hit the lottery, because I run locked 59fps at 3840 × 2160 with Sol & CSP on decent settings...and I love the grassFX.
It adds a lot of track side immersion if done right. Same with 3D worn curbs and tire/groove marks on the asphalt.
Everyone has a different taste for settings. I like a kind of hazy environment with not an overbearing contrast. Crisp but not so sharp that it doesn't look real.
I was on the 'Sol' filter, but now I run on 'movie' because of how the sun looks in it. I tweak it from stock, but I like the tone of what it does as well as it has good FPS over others.
I've also noticed that depending on what CAR I'm in can also effect the
look of the filters.