Rear shock feels soft on large bumps or jumps. Increase shock compression damping. Decrease race sag. Install stiffer spring. Shock made need re-valving.
Rear shock feels too hard over jumps, large bumps, or a series of small bumps.
Decrease shock compression damping. Install softer spring. This is caused by soft forks. Slide the fork tubes down 5mm in the triple clamps. Increase compression damping.