Very nice shots! What sort of settings were you having to use? I'd imagine that the light wasn't that great, so must have been tricky to get good exposures...which you did!
I was using 1/80 or 1/100 on that spot.
What metering mode? spot would have been best, imho there slightly over exposed in the highlights, maybe a poloriser may have helped or lower iso, i think most of mine where around 100-250 max with may be a couple higher then that.
I cant wait to return again for the BSB again, i went to the first rounds there earlier this year great circuit for bikes.