The average length driver on the PGA Tour is 44.75 “. The shorter length helps players find the center of the face more consistently. This not only improves accuracy and dispersion, but also increases ball speed through better contact. For years Tiger used a driver around 43.5 “. Rickie Fowler and Rory McElroy have used drivers in the 44 ” to 45″ range. Consider using impact tape or foot spray to see where your driver strikes are. If most of your strikes are clustered near the center I would leave the length alone. If not, consider taking some length off to improve your center strikes. In most cases a player will gain more distance from better center face contact than from an extra inch of shaft length.