weight of bike and weight of rider

[LiquidFeet]

I weigh 115 lbs, and I have a 32 pound all mountain full suspension Marin, and a 25 lb Titus Racer X.

The Marin is better on the terrain in the NE. It is heavier for sure, but it takes the hits much better. The lighter bike does not stick as well over the rocks.

Lighter may not be your solution due to your location.

That's exactly what I'm talking about. When I ride full speed down a fairly straight New England rocky hill, I have my butt off the seat and back a bit beyond the saddle. I attempt to visualize my line, ignore the rocks on that line unless they are big enough to hit the chain ring, and just go. I keep my torso smooth on its path down the hill, and the bike bounces leftie-rightie beneath me. A lighter bike bounces MORE. A heavier bike, with its added momentum, bounces less. I've checked now, and know this from experience. Both are hardtails.

Would full suspension make a difference if my butt is up off the seat?