Try a different driving technique.
If you're lifting off then turning you'll have a strong front weight on initial turn in. Even a small steering input will give a lot of turn and the back doesn't have the weight to hold on.
If your car has a gentle understeer everywhere else then it sounds like you're setup is ok.
Try starting the turn (gently) still with the power on, this way the rear is weighted up. Then ease off the gas and increase the steering as the car slows.
Turn then lift gives a much more stable car than lift then turn. This applies to big cars and little ones :-)
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