You guys are close but if you really want to boost it up remove some weight. Why stick with liquid cooling? Remove anything related to the cooling system and switch to air cooled cylinders. Remove all the plastic, wires you don't need, and the braking system (just downshift to first and use the clutch to stop it) things like this will give you a serious edge over a lot of quads out there. Your buddies you lose to will never see it coming.
All the other mods listed are a start, but shaving the unecessary bullshit from your Shee will really make it stand out when it counts.