I have a few Extra's ;nitro ,gas, and elect. All of them tip stall at slower speeds however they all fly like they are on rails. Just have to be on your game when landing. I also have an Edge , Slick, and Sukhoi and they too will tip stall if flown too slow. They also will start to act very wild if the CG is moved to make it more tail heavy. It can be a hand full until you get used to it. Try reducing the elevator throws a bit on low rates for awhile until you get comfortable with it.