looking through the race tech web site I noticed they show most mx applications with the shock oil weight of us0 "2.5wt" and the forks us1 "3.5-5wt". Do most of you mx type folks run a lighter weight oil in the shock than in the forks? I thought the shock worked harder got hotter and needed at least the same weight oil as in the forks? Whats the deal? I currently use 5wt silkolene front and rear..