I never had an issue with the tip stall either..... but I never could totally fix the issue with my leaky retracts, that and having to keep rebuilding the center section is what I found most annoying.... A couple of weeks ago I flew a buddies boomerang XL... If I only new then what I know now...my god that thing flew great!!!! I never even attempted knife edge or a snap with the A10x, but with the XL boomer it felt so light and true that on the first flight I did great 4 point rolls, loops with snaps on top, hammer heads, split s's, felt just like a patter plane..... not sure if this makes since but the boomer felt like a trainer-pattern plane.... and the A10x felt like a heavy warbird, that mixed with the fact that the retracts were crap is why I would totally recommend a boomer (although I never flew the small one).