Go slower. The UF1 doesn't have much grip, and there isn't anything you can do to improve it other than lots of camber and slower driving. This is why the UF1 is infinitely harder to race than the FOX.
you also have to change your driving technique, since it is a front wheel driven car you can stabilize it under braking with some throttle control, that will (should) stop your drifting.
Never coast, be always either on the brakes or on the throttle... The setups and the open diff are so that you swing the rear round in the transition between braking and accelerating, being stabilized by more throttle...
Yup, but its HOW fast you go slowly, the uf1000 rewards those who can drive smoothly. There is much skill needed to keep the UF going as quickly as possible with out unecessary braking and or turning.