Besides the fit issues, are you doing anything to make sure that your core is strong? I had a lot of neck, shoulder and arm pain, so much so that I went to a physical therapist. I got a set of exercises which I now do religiously to strengthen my core plus address arthritis in my neck. It has made a world of a difference in my biking comfort, provided that I never let up on the exercises.
Trek Madone 4.7 WSD
Cannondale Quick4
1969 Schwinn Collegiate, original owner
Terry Classic
Richard Feynman: “The first principle is that you must not fool yourself and you are the easiest person to fool.”