Went to my 2nd A.R.T. guy today. Gotta say his demeaner wasn't as friendly as the first guy but he was definitely more experienced/qualified...seems like he really knows what he's doing so I'll probably stick with this one and just find a way to get there even though he's further away.
Normally if I try to touch my hands behind my back (one over one under) they are 4in apart on 1 side and 6in apart on the other. He went through 4 different things not giving up until I was able to touch on both sides (1 side even overlapping which I haven't been able to do in 4-5 years). Seems like he has numerous methods to fix the issues but emphasized that it's also important we work on my mechanics when lifting because I have long arms and legs and I've got "some muscles working overtime and others slacking off" as he put it.
Also to whoever mentioned a biceps tendon issue, he said the soreness I feel in the anterior delt region is the biceps tendon being inflamed. That's not the pec issue I started this thread about but still it is a minor issue.
He doesn't feel like the pec issue itself stems from a nerve problem even if the little twitch I get may be related to the nerves.