Do you mean something like this?
http://themxtrack.com/Gomer_1981.jpg
If so, what I did there was remain standing all the way up the jump and lean way forward to balance the fact that you are full throttle. Once in the air the bike should naturally level out and you help it by pushing the bars down and pulling your legs up to let the rear end ride up under you.
Seat bouncing, on the other hand, is when you stay seated and your weight compresses the suspension some, rebounding on takeoff to make you fly higher, and therefore farther. You should only seat bounce when you are already doing everything you can with full throttle and it still isn't enough to make the jump, otherwise you are wasting time in the air by flying higher than necessary.
When you say he was "outjumping" your friend, do you mean farther, higher, lower, ... ?