I just checked my CG and found it was a hair farther back than 4 1/2". This measured from leading edge of wing, right on fuselage sides. With the CG this far back, (the manual recommends 4" as a starting point) stalls are really sharp and come without much warning.

I can't harrier with it since the wings rock too much.

On the other hand, torque rolls are really good if you are able to slow rotations enough so it remains controllable. I have found it really difficult to bring it low because I am not able to loose altitude while torque rolling. With those stock control surfaces, I need all the wind that's coming from the prop all the time.

I have not tried walls but will as soon as summer comes back here.

Blenders are incredible and inverted flat spins are perfect.

The only recommendation I can give you is set your CG slowly since with my CG location, even on low rates, I can snap roll, spin, flat spin and even blender my plane, and thats with the non modified plane

If my memory serves me well, I think you have changed your wing ribs and spars for lighter material. Is the airfoil changed?

Bring those vids soon !!!