Well, haven't tried them in rre yet, but if they are like real life fwd racecars (i would hope they are), you should master brake balancing with your left foot. Try to shift the balance by left foot braking, especially mid corner. If you hit the accelerator too soon, you will understeer.
Imagine a line through the corner where you "flick" the car at the apex. Brake hard and late to fix weight at front, then throw the weight of the car hard towards the apex. This should rotate the car around a more forward point, this gives you looseness, at the rear wheels, so as soon as you have the car lined at the apex, counter this by accelerating and let the front wheels pull the front back in line. If it starts to understeer, stab the brake with your left foot, while keeping full throttle, to balance the weight.
Instead of sweeping arcs, throw the car at the turn, to make use of the ability to pull the front back outwards, and to counteract the often massive understeer when on throttle.