[super__dan]

Mark,

On XX4 and X5 (And XX4 for that matter) I always trim the inside and outside row off. If it's very high grip I usually trim the 2nd outer row as a first port of call with too much steering before I alter any setup. Tyre balance if best first, then subtle setup. I had inner and both outer at Bury on Sunday and most likely would on a grass track with a decent coverage of grass, only run the extra row on dusted up tracks.

Dan