Some flexing is OK. When people see my Tribute fly for the first few times, I can here them go "Whoa, he was lucky, next time it'll fold" or "Let's go offer him a bag, he'll need it soon." At first, I would only do low stress aerobatics like hovering, harriers, and rolls, but gradually I would do a loop, then two loops, then tight loops, and right now I have done inverted snaps with opposite rudder, and waterfalls, and all the other flexy manuevers that really flex the wing. It has yet to even get close to folding, none of the carbon fiber, tape or bluecor shows any signs of damage. I think you should try a new 3DX Edge, but without all that CF, and a cheap motor to really see how flexing is fine. Dan