I had a smal 2.6M ASW-27B which tipstalled quickly if I pushed it to hard in turns. I got a very good advice which solved it for me: “move the CG backwards”. The theory is that “a nose heavy plane have to fly at a higher angle of attack” (I don’t know the aerodynamics behind this though). When a nose heavy plane is flying at a high AoA just to maintain level flight, it’s more likely to put it at an AoA past the stall limit when turning.