i'm a TT01 user also, before that i have the same problem, once on track the car will sping or not drifting at all like touring hahahaha...
my setting now, lock front and back diff (差速), front soft and back hard.
camber front 2 back 2.5, high front 5 back 5.5.
now can drift smoothly but still will have over or under steer.
TT01 got wight problem (重量), if u use 4600 bat than 1 side will be heavyer than the other side, i will suggest set the high 1 side higher than the other side to balance it than may be will be better.