Regarding the wing rock.

What you need to be looking for is getting off the ailerons with the right thumb. The Sukhoi has virtually no wing rock when the stick is aileron centered, Use the left stick with a little rudder to offset engine torque and P factor at a high angle of attack. Steer with the rudder, using the ailerons only to keep the wings level when turning. Add some expo to the ailerons.

If you are experiencing wing rock with the plane it's the operator, not the plane, with a center of wing tube c/g.