Forged or cast makes little difference. There are 'players' clubs, and 'game improvement' clubs. Some are forged, some are cast, but forged or cast makes no difference in how you are able to play them. The process in which a club is made isn't as important as the metals made to make them. If you are happy with your current set of clubs, then I wouldn't worry about it at this point as long as the shafts are still okay for you.