Can someone attest to the IL-2 having an inaccurate FFB implementation? I recall watching a discussion on a Russian channel about this issue.
Essentially, the way that IL-2 simulates loadings on the stick (for springed joysticks), is to require you to pull back more on the physical stick as a way to simulate a stiffening of control surfaces.
When FFB is enabled, this phenomenon persists, leading to an uneven force requirement as you pull back.