I’ve the same model.
i haven’t tried the rudders or flaperons like you have but I do have the stabs set up for roll control.
i now don’t fly it without the aileron/delta mix enabled. Id always previously found that I didn’t have as much roll authority as I’d have liked. The ailerons are bottom hinged, and I never had as much upward movement as I’d have liked.
The delta mix on the stabs sorted that out, without any adverse effects that I’m aware off.
i am using a powerbox completion SR2 and iGyro sat.