I have developed some pain playing my Thunderjazz, it's dull pain in the center of my palm. I have been playing MANY years, and back in the 80's had to quit playing my '66J (D profile) because of fretting hand cramping. I've avoided 1.5" necks ever since. The neck I put on my Thunderjazz is a 1 5/8" with a shallow profile, and up until now it has been a joy to play, and I practice at home with it. The second day I experienced the pain was a band practice day, so I practiced a little at home (pain again), and went to band where I use the ThunderP, which has a 1.6" neck with a slightly thicker profile, and didn't experience any pain.
Yesterday, tried the Thunderjazz again, pain again. Pulled down my '59 NOS CS P, 1.75" with shallow profile, and the pain went away.
Any suggestions short of not playing one of my favorite basses of all time?