| I've recently been working on a floating thumb approch (instead of anchoring) and had the exact same problem. After paying close attention to my hand while playing at speed, I realized that I was tensing up my hand and forearm to compensate for not having my anchor point. I went back to doing slow, focused right-hand drills, ensuring I keep my hand relaxed, with lots of shaking and stretching, and the problem is about worked out now.
However, a few years back I had an issue in my left arm that just about ended my bass playing permanently. If you can't work the problem out rather readily on your own, or with a bass-playing friend watching you play, get to an orthopedic specialist. It just ain't worth the risk. Also, if you do have to see a doc, take your bass. It was invaluable for my left arm diagnosis for the doctors to see exactly what I was doing that caused the injury.
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The groove is in the spaces.
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