Its not so much what you weigh but "how" you position your body and weight for speed(assuming everyone is close to weight). First off Paolo is right a properly waxed board is key. Keep in mind for events like the Jeep runs and stuff those guys wax practically every run...just like ski racing. Wax is key..
However in general principal, just having fun type. You can pickup speed if you crouch low with head slightly forward(if that makes sense) Keeping the board on the snow. As you are moving if you can position the weight toward the front then speed will increase.
If you want to "catch" your friends dont hit any air..let them. That is where you catch up. Keep the board on the snow, stay low, avoid turning and wave at them as you pass them hopefully.
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