[GhostlyRock]

Take note of what the slowone says, 1/12th guys have loads of experience running foams and fighting grip roll. The smaller the tyres dia. generally you will get less grip roll due the rubber not moving across the tyre as much.
I bit the bullet, trued my tyres, 45.5/46.5, 35 rear 47 front, still run the kit springs, car handles a dream. If you still get it in high grip situations, superglue the front sidewalls and go for a softer spring, trust me it works.