Lift the rear of the car up a little, or lower the front (5-10mm). Either way.
What pads in the rear?
LSD and bit of trail braking will help it turn.
The characteristics sound similar to my car. In that I have chewed up a set of front 595rsr (onto second set) while the rears are still going strong (still on first set).
Bit or trail braking and steering using the right foot seems to work well at winton.
I would try for a 595rsr. Wide as you can get on front, 245. I will be trying that next tire set, if I can.