couple of things worth checking:
1. slipper clutch - does it actually slip when you apply the throttle?
2. dampers - do they move smoothly?
3. ride height - with all the radio gear including battery, how high does the rear end sit? the driveshafts should be level (i.e. a straight line across the horizontal axis).
definately worth expermenting with tyres too - they're usually the first port of call, but it sounds like there's something in your setup that is compromising the way the car works the rear tyres - too much power, to agressive throttle curve, or possibly a trigger happy left thumb!
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