Heya!
you mentioned grass density, but is grass distance also high? Try lower that if you boosted that.
grass height doesn't affect performance in any real meaningful way but grass density, distance and grass shadows do.
Also, try disable MSAA as it also has quite a high CPU penalty (in Graphics options -> Advanced -> Disable "Anti Aliasing" and rather use SMAA (just below Anti Aliasing), not as pretty as regular MSAA but performs a lot better.
Another thing you can try:
Open user.ltx (contained in anomaly\appdata) with notepad and try set
r__optimize_dynamic_geom 1
r__optimize_static_geom 1
You mentioned having an AMD RX 6900XT, try DX11 first as it should perform the best on modern systems but if you get random crashes, try DX9, there's a known issue with AMD GPUs on DX11 on all Stalker engines, sadly we don't have a fix for it.
Hope that helps!
meatchunk
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