RE: understeer
Torque steer? Thats fantastically wrong.
If you can't 'turn in' after going down a long straight, you may want to consider using the brakes. I know it sounds simple, but do it with a bit of steering and you'll see results.
Furthermore, try adjusting front toe angle. Toe-in at the front will allow for a greater amount of 'lock' on the outer wheel when turning in. This can make the car twitchy during longer drifts, so experiment to find a balance.
Chris.