Is the string Flemish or endless loop? Flemish need twists to stay together, roughly one twist per inch at least . This will hold silencer's in place as well. Endless don't need as many twists and don't hold silencer's as well unless they are twisted up pretty good. The twists are used to adjust brace height within reason and if you can't reach the optimal brace then the string is the wrong length. Remember, all strings stretch, Dacron more so, and will need adjustment after the first hundred shots or so..