Why releasing the main would power up? I agree with you that neither DH neither traveler are giving a quick and efficient enough response. From my own experience (Tiger with square top) I feel that pumping the main does the job: releasing it makes the top of the sail twisting and then the power goes down. As soon as the wing exceed 10 knots this is my crew who handles the main (except when chute up): he has two hands to do it, so much more power to pull the sheet.