I think the bits are front heavy. This is what causes the car to spin so easily. The lack of weight causes the tail to lose traction.
This and the lack of proportional steering. Because in reality when you start a drift the car doesn't have all the lock in. so it drifts like this \ \ , but with bits, the controler is either full left or right, so the car would want to do this = . ( sorry i dont have pics)
Any hoo, with slightly more weight in the back, the rear tires will have just enough traction for it not to spin out.
So if any one has the ability to get the measurements, please share

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NB we still dont want the front & back equal