Set up the buggy to be as light as possible if your having issues w/ chasis flex. I think the car was designed to flex some because it makes it more forgiving on rough u.s. tracks. Perhaps run a neu 1509 2y w/ a 6s 2650 lipo & a MMpro. That would shave about a pound off of alot of the setups you guys mentioned right here & get your 10 minutes of run time.