[michahicks]

While it's not my first choice for ruff stuff, it's not that bad of a suspension. There are optional springs available for it, the dealer should have told you. But first you might try increasing the tension on the front rear suspension shock. The fact your buddies can carry a bunch of extra weight on their sleds only means one of two things
1. They know how to set up their sleds for the extra weight.
2. The machines are so stiff they can't possibly have a decent ride with just one up.

AL

 

[michahicks]

You've made a common mistake on that rear shock. Even when it's new it will push in A LOT easier than it will pull out.
Car shocks are the same way. Shock designs on the very newest sleds are just now starting to get away from this idea, are working at 50/50 or adjustable compression/rebound. If it's a FOX shock make arangements to have it sent out to a dealer that knows what he is doing. If
it's not a Fox, get one, and have it revalved to your tastes.