Cutting the inside of the tire off can cause it to get twitchy down the straight away. Last time I was there, I cut 2 grooves in each front tire, glued the edges, they were cut to 57mm and the rears were cut to 59. Blue springs all around, 40 wt in rear socks 600 in front, front shocks all the way down, rears in the 3rd hole up. Front upstops set with 1.5mm of travel. Droop, 1 and 5. Camber 2. Caster, 1mm. B blocks all around. The car was very fast.