I think you have your trim issue stated backwards,,
Probably , it pulls to the canopy on right knife, and to the belly on left knife.

Unlessyour elevator halfs are already out of wack! (right elevator up left elevator down )in the rest position.
If this is the case you will have left rudder trim and left aileron trim as well , also it will be yawing to the right on pulls to up lines and pull louts as well

There is no way the airplane is doing what you discribed unless ,the c/g is at 20% MAC, unlikely, or the elevator halfs are uneven to start.
Never! ,, trim elevator halfs different to trim knife edge issues.If you think you need to the airplane is not set up correctly.
your g/g is too far back for the wing Inc your flying.

The "spiral prop wash" has no effect on knife edge. its just BS pit talk ,your airplane is just not set up correctly
Reverse pulls on knife are 99% of the time due to c/g and inc. settings unless something is crooked or not adjusted properly.
Everything else is fall out from that!
Bryan