I ordered a stl-13 with std and ivory shafts, both 13mm. The requirements were both shafts must weigh 4oz +, and the cue weigh 19 1/4-19 1/2 oz together. The ivory shaft is 4.02 oz and std shaft is 4.27 oz and butt is at 15.8 oz. The problem I'm having besides a heavy cue is, as long as I hit soft or easy it sounds fine, but if I have to bare down with draw or follow or english of any kind the stick has a chatter or thug as if I'm overpowering the cue. It does not sound solid. Sent it back to schon to listen to it and change the weight bolt to lighter one, they say it sounds fine. The older schons didn't sound like this, can anything be done about this? Thanks in advance for advice. JSS