Hi!
It stalls! That's why it snaps to the right when turn left hard and pull lots of G!
Why? Because it's too heavy or you have too much elevator throw or both. Or the wing is twisted (has wash-in at the tips)!
Have you checked wing with a Robart meter so it's straight?? 0-0-0 degrees on both ,engine, stabilizer and wing is the norm on most model



airplanes.