I just wanted to report back to everyone who may have been watching this thread with interest. On Monday of last week I went and got a proper Retule bike fit done. I had no weird body issues(one leg to long, inflexable, etc). The end result was basically that my seat was probably an inch to low(which put me near the max line now). The fore aft position was adjusted some as well. I also changed my seat out to a Specialize Power expert. At this new seat height I really need to bring my stack height up some, but there is no steertube left and I’d have to go to something weird like a flipped negative rise stem. In other words, my bike was to small! I’ve already picked out a new one (going from a 58 to a 60cm, but a 90mm stem).
After I started this thread, I also started stretching daily. Hamstrings, quads, glutes, lower and upper back, neck, and chest. This has been fantastic and I’m kicking myself for not starting sooner. My posture has improved and in general I’ve felt great. I’m adding core/trunk strength work to this soon.
Today I did a 65 mile charity ride and I stepped off the bike at the end feeling great. My lower back was very minor stiff/sore(nothing at all like before), but my hands never got numb, and I never found my shoulders in my ears either.
Big thanks to everyone who took the time to reply!