I had all of those problems and un-requested snap rolls during some maneuvers. I tried different CG positions, and yes, I balanced the airplane laterally when it was new. I have also re-checked that. I tweaked the elevator travel and they are together at all times. I used an OS 75 AX which was not overpowered for sure. The final issue was a slow speed landing in 1ft. tall grass. I didn't break the prop or bend the landing gear, but the whole front half of the fuselage came apart at the glue joints and the tube broke out of one wing. Those tubes sure don't go very far into the wings. I have repaired the wing, but I haven't found the ambition to fix the fuselage. If this airplane was a better flier, I would spend the time and do it right. I just never enjoyed flying it.