Hey DinosaurTT, things are going great now. It is really only in the last two weeks that I feel I have been playing really well, with my arm loose and relaxed and the pain and stiffness have dissipated. I started back hitting in mid-July (about 10-12 weeks post-surgery) and it was a little sore and uncomfortable. I needed a good two or three days in between sessions to recover. Now that it is nearly 5 months, I find I can play more frequently and not have that niggling feeling that I could be stressing my arm.
I got some great serving tips from a local coach (the first one I met here who understands proper arm/body mechanics for serving) and that helped a great deal.
Still stretching every day and doing resistance band exercises nearly every other day.