Since I got my new Pbass my left elbow has been getting sore. I played a Jazz bass for several years and never had this problem. I have tried making the strap shorter and longer but nothing seems to help. Only two things come to mind as to why this is happeneing. 1. The Pbass is neck heavy. It seems to be putting a lot more stress on my shoulder that my Jazz did. 2. All the tunes I am doing atm have me playing below the 5th fret. I used to play a lot at the 5th fret and above. Playing in first position all the time makes my shoulder tight as well. I have been looking through my Peter Murry technique book for a clue as to why Im getting sore but I did't really find my answer. Maybe after playing guitar for 23 years my body has just permanenty conformed to the arm position used for that shorter scale length haha.