I don't discourage anyone from moving up. I do discourage them from moving up TOO SOON. Everyone is different and a stable high wing trainer is ALWAYS going to be more forgiving of human error, up to a point. You have merely gone the next step, a low wing trainer. You won't believe what's still waiting for you out there if you think THIS is an upgrade. There is a reason the Nexstar doesn't do a decent knife edge in stock configuration - it's not supposed to. That's NOT what it was designed for. It WILL fly inverted quite well though, once you learn how. Apparently a skill you rushed past. Anyone (almost) can make an aerobatic plane fly inverted, it takes a bit of skill with a plane like a Nexstar. Stay with the low-wing if you wish but once you get the Nexstar fixed go back and learn the basics.