got 2 10's in the back one 5 on the bulkhead, oil shouldn't be the problem really as it's been set up like that for a race that day and went very well, it could well be the small jump, I was just using a folder in the drive, so I could see that throwing the back in the air as the front 'lands', i'll have to try it at cml on saturday, we don't have any big bits of card atm