For FSR to really shine, turn off RSR. Turn on VSR.
put all settings to ultra or as high as your GPU can take .
set the sliders to 100 for details
turn FSR to Quality
put your resolution one step above your native screen resolution
so if your monitor is is 1080 make the ingame resolution as 1440p. if its 1440p, make it 2140p and if its 2140p keep it at that
Also make sure you use Radeon Performance tuning to overclock and undervolt your GPU.
Going from TAA ultra to FSR ultra i get a 20-40% fps boost and the boost is higher the higher i go with VSR