Whipping your car has zero benefit unless you are correcting for a bad takeoff, or setting up for a corner after a jump, or exiting a corner and not squared up while hitting a jump. All good drivers can and do make throttle and wheel corrections over jumps. Those of them who do whips over jumps on straight parts of the track are just playing and hurting their lap times.
The only way to adjust the height attained from a jump is to be on throttle up the face to bind the suspension and not allow rebound. Plain and simple.