I'm not a big guy, 140 lbs, but I've not had much success with scooters that size (under 500watts).
For my bucks, I favor the SuperScooter Elite and Lithium series at 800, 1000 and 1500 watts.
They are bombproof and haul ass- even my big 200+lbs friends. . Goped Hoverboard is $$$$ but was...