The little button works on the same principle as the whiskers�it removes vibration and acts as a dampener for the string. Often, if you take it off you will lose a 2-5fps but I would leave it on. On your STS, that is a ton of wear! Mine has probably 10,000 shots on it and isn't anywhere near that type of wear. When the bow is in the down position, it should be off of the string about 1/16th of an inch(you should just barely be able to see daylight in between the string and the stopper). If it pushing against the string too hard, or is too far below the string, that type of wear can occur.