Simplest thing is keep the thing on Sports Tyres. S3's seemed to be the best improvement with it. The R1-R5 tyres seem to stop it from accelerating properly, no matter what the ride height is and I'm yet to find a reason why.

I've run 10.4's on the 1/4 on S2's, but when I slapped on any racing tyres (even R1's), it was impossible to get better than a 14!!
Too bad too, I reckon it could hit 8's without that hinderance.
Mafs!!