I have the dedra front arb and white line 22mm rear but I also have concentric washers for camber up front and fixed caster top mounts so I get more camber on turn in. I have just gone to 350lb springs up front and I am swapping between 325lb and 375lb rear springs. I don't really suffer from under steer, only push on "power under steer" if I am to eager with the throttle, my rear is pretty stable with my driving style only if I turn in hard on the brakes does it go light.
