hey Lee, i have the same trouble driving my oneway.
on tarmac its great(i can even brake with only a little wiggle in the back) but on concrete, i hate it it spins rite out with just a little brakes.
but i'll tell you how i drive it on the tarmac
into corner - power
midcorner - off power
outof corner - power
i'm prolly wrong but i think you want alot of off power steering.
what i've been trying to do is scrub off some speed into the corner with understeer, then rotate thur off power then nail it out.
doing this i can go fast and no need to brake.
btw, i'm just learning myself