For drifting in RC, basically you need a perfect balance between slip and grip. RC cars have to drift through the corners, while you also want control of that drift. RC drifters usually tune grip in or out by changing the way the chassis transfers weight i.e more grip up front equates to more steering. This is the basis of chassis tuning.
All adjustments require a properly set up RC car. No bad bearings, nothing binding, droop is equal side to side (not necessarily front to back), ride height is equal side to side, camber is equal side to side, etc.
These set up changes should be made one at a time so that any change can be noted. It is also best to start with a fresh kit and work from there.
Believe it or not, RC companies do put R&D into this and provide the most beneficial all-around setup for kits.