Suspension setting are important, but the fact of the matter is that it is in a constant state of movement during a ride. With all components being in good condition, it could be fully extended one moment, and be in compression the next. Not sure how settings within a reason would add to the spray. There is snow kicked up from the back end of the ski's contributing to wet passenger feet and calf's. I see the back draft as causing the most issues during a 200 mile plus ride for the day. My SkiDoo has a 136" Polaris extra 10 skid in it now with rebuilt gas shocks all around, and both stock and modified skids had the same result. A soaked back and butt makes for a cold ride for the passenger. The water proof gear is a excellent idea.
Just my .02
MAK