definely check out www.DrifterCentral.com/forums
community for a active and dedicated forum on TA03's.
anyways, what you have is understeer which may be caused by less grip in front. what you can do is use the softest possible spring in front coupled with 20wt or lower oil all around. lift the rears ride height in small increments until you feel a difference in handling.
my drift setup on a TA03F Pro and TA03F-S TRF are locked diff front/rear, torque splitter (optional), 16T pulleys front/rear, super soft spring front and soft spring rear, trf dampers with 20 weight oil, aramid belts, pro gears.
btw, we run Tamiya Driftech tires on almost all surfaces here but other run HPI T-Drift's. on really rough asphalt we use home made HDPE tires and ABS, these are our practice tires due to cheaper cost and availability.