Just don't run 5w-30 at the track.
I'm at -2.5F -2+ R and I could use more up front.
I wouldn't normally run so much in the back but, I need it to get clearance for my tires and wheels. The car's fairly neutral with a touch of understeer. I could probably dial it out by going one stiffer on the rear bar. I'd had a 27mm front bar and didn't like it for the track. The front end tended to skitter over bumps. I think because the bar prevented the suspension from acting independently.