Hey Hosehead, sorry to hear about the tricep but at least you got the spurrs off right? That should help with the pain hopefully! How you described your lat problem reminded me of a some stuff I learned about last year. It sorta sounds a bit like potential long thoracic nerve damage? The long thoracic nerve runs along the seratus and is very open to injury because of how long the nerve is and how close it rests to the skin. If you look it up, you'll see a lot of people with the winged scapula condition but I'm pretty sure you could tell if you had that. My anatomy prof actually injured it many years before and when she was teaching us she stopped and showed us her mobility of one of her arms. She physically could not get her arm past her shoulder level as well... just stopped dead there. Apparently there is no pain associated with it (for her at least) and mobility below the shoulder level is fine. If that nerve is pinched, maybe you could have decreased mobility in the flaring of your lats? Not saying it could be at all, but it does sound slightly familiar and it's something you could get just asked to get checked for easily I assume. Just my 2 cents... don't have to roll with it if you want.
Stay strong man! All the best for your recovery!
-Primal