Hope all is well mate
Subluxing collar bones, hmmmmmmm. oh yes
Mine are real floaters, and a real pain. My A/C joints are now almost permanently subluxed and after nearly 7 years of it starting are now better out than in if that makes sense, when they are properly relocated get lots of pain and disomfort but when 'out' are generally ok. The joints at the throat end (not very technical
) can be agony if they start going out.
So in short, yes can totally relate to the floaty collar bone and in particular when carrying heavy weights, but luckily for me has settled quite a bit - was offered opportunity to have A/C joint pinned but refused thinking it would only force it out at the other end, glad I did now.
Hope this has helped, take best care Emma