Reasonably lower offset then, your wheels must sit pretty flush with the arches. And your still catching in the middle like I am. And maybe the outside too? I know I was slightly as the top push clip was worn out, haha.
Raising it will be the only answer really I guess which is a shame.
As for stiffer spring rates, I've tried upping the dampening on my HKS coilovers and all I ended up doing was loosing traction. Knockhill is quite a bumpy track in places and just ended up with wheel hop when trying to the power down out of some corners.