I do like the string suppressor. I shot bows with and without a string suppressor and like how it reduced shock, noise, and arm slap. I originaly had the suppressor in the downward position, but turned it in the upward position where it would make contact closer in relation to where I nock the arrow. This did have a slight benefit in performance of the suppressor. I also found the string contacts the suppressor more evenly in this position. When I had it in the down position, the rubber stopper was slightly canted in relation to the string. I did this after doing some searching on Archery Talk. Also, I have the front mount Duravane String Tamer and the instructions state to get the stopper as close to the nocking point as possible.
As far as string gap, I did alot of searching and trial and error and found I have the best results with the string slightly touching or a very slight gap. When I tried the credit card gap, I didn't feel like it was as smooth as the slight touching/slight gap position. When I had the string resting on the stopper, I felt the string "slapping" the stopper more pronounced. I hold my bow up to a light and can just barely see a gap between the stopper and the string. This works great on my Trailblazer and I do not think about it anymore.
Good Luck...I know very little, but this is what I have found works for me right now.
