Trying to figure out the mechanics of a certain situation. PC grapples enemy and uses a move that doubles movement speed. Following that, a stacked move allows the PC to carry grappled enemy 60 ft into the air. In this situation the PC has an added benefit of not taking falling damage. The goal now is to force the grappled enemy to fall with the PC into a 60 ft slam. Would added flying movement downward add to damage? Also, if using flying to assist the slam, would that remove the benefit of no damage while falling for the PC?
Backround info: PC is a Mystic under Order of the Immortal, using the Body of Wind Discipline which grants no fall damage and ignores difficult terrain just with the Psychic Focus. Also in Body of Wind, Mystics can spend Psi points to gain 20ft of flying speed per Psi point used up to 3.