You know what I find that works reaaaaaaaaallllllllllllllllllly whell with the more unstable cars? A locked fully customized LSD. 6,600cr I believe and I normally run 10-15 for initial, 30-50 for accel, and 15-25 for decel. (higher number = more stable) for that car I'm running 15, 45, 20, and stock racing suspension set up (ecept for I stabilizers, front stabilizer at level 4, rear at 5), with n2 tires. I can control it just fine with that.
Hope that helps, Good luck.