RE: Knife edge tucking
the way to determine if KE pulling or pushing is CG related is easy......
1) pull from level flight at intermediate power to 45 degree upline
2) Roll 90 degrees to KE orientation
3) let go of the sticks..... let the plane assume a trajectory NO RUDDER INPUT
did the plane pull or push?
now repeat but apply top rudder.... did it pull or push again? Same as the No-Rudder test?
I bet most pattern/aerobatic planes in the No-Rudder case will very gently pull to the canopy from the positive stability trim condition...
and I bet most will push towards the gear when rudder is applied.....
also try.... apply rudder from level inverted.... most likely the plane will climb