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Alex, as you look at what Kaitlin has posted, i would also add that there sounds like a strong chance that you have protracted shoulders where they have drifted forward of their sockets. the pec/pec minor/ant delt tightness is probably making that condition even more established and is often evidence of protracted shoulders. if they are very forward, you will find it hard to do any kind of overhead at all and will increase the risk of shoulder impingement problems.