if you want to reduce understeer while braking then make the back brake stronger than the front brake. Some camber on the front wheels can help, but not too much try 2.0 or so.
This is straight out of the apex book I got with the sign edition . To reduce understeer . Reduce damper force for spring extension in the rear will increase oversteer . Hope it helps anyone else needs tune advice out the book add mr on psn Kingchesh I will let you know what Apex says