i also use string leeches and an STS string stopper, that works really well. you could use a string stopper without any addition string dampeners, like the leeches, that would help you to keep your speed. i dont leeches cost you must speed, i have been using them for a couple years. ive never speed tested my bows with and without them, so i dont know how much they slow a string down. i wouldnt imagine more than a few fps. i go for as quiet as possible, so im fine with losing a few fps if it means im a little more quiet on the shot.