Break up/debris has always been a problem at every event in the later part of the day no matter the location. You have to drive the line that is still clean even if you don't want to...
As far as awd VS. rwd, not sure surface is a huge contributor as long as you are not in the super loose stuff. 7th place in pax in an underprepared CS Miata ain't bad for proof... Top 5, look out, here I come...