I agree with mostly everything posted. I have flown some peoples overweight airplanes that would not tip stall, while light ones that would snap if you breathed on the elevator or slowed it down. My old H9 540 would 3D decently, but had the same problem. Had to come in at a very high speed or you would drop a wing hard. It was OK at high speeds, fine in high alpha, but it hated being in between. I think it had a warp that got worse over time in the trailing edges of the wing tips, and it weighs 16.5 lbs wet, so that wasn't helping the problem at all either.

Brandon