Having done max power runups we usually set the opposing wing to about 60% thrust, the weight of the aircraft has allot to do with it. I have been in an observer seat on a short field (abnormal/ferry) T/O, empty MD-11, brakes set, thrust set to about 80% N1, I could feel the damn gear kick underneath us on release and we broke ground in short order. Just about blew our initial assigned altitude before the guys could clean her up. Great memory....