You ever try getting a lacrosse ball deep into your pecs, especially up near the clavicle? It's been on the MobilityWOD a couple times, I always get trigger points to release when I do it, it could be related to some sort of upper pec and/or subclavius tightness.
Prolotherapy to the joints that are typically affected could help to tighten up the ligaments. Nightshade avoidance can help to reduce pain and popping quite a bit for sensitive folks.
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