It sounds like your rear diff may be too tight - a tight rear diff tends to make the car slide (by breaking the traction of the rear tyres) out of corners, a loose one will make it slide when entering, or mid-corner.
You could also try some pro-squat (I run a TC5 and can mount the rear of the rear wishbones higher than the front of the wishbone). That promotes on power rear grip. I find it useful as it also ever so slightly dumbs the front end down when powering away so you can make rapid direction changes under power without spinning.
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