Jarrett (in the Broken Embouchure thread) brings up the topic of Embouchure overuse syndrome and you seem to know a lot of good stuff.
I have been in contact with Lucinda Lewis, Principal horn, New Jersey Symphony and described my situation and she said I have all the symptoms of Embouchure overuse syndrome. (She has a website dedicated to this topic: Welcome to Embouchures.com ). I was explaining that I had no pain or discomfort and I don't think playing 1-2 hrs a day is overuse, but she said the syndrome need not be caused only by overuse but also equipment change/tweak, which is exactly my situation. I've posted here before about a MPC tweak I had done over 2 yrs ago to close the GAP, hoping to improve things, but instead, everything unraveled. I've since had a duplicate of my MPC made in hopes of reconstructing the original specs but as Lucinda said, "'...even if your mouthpiece were magically restored to the perfect model you used successfully, you would likely not feel it". So I cannot seem to get back to where I was before the MPC tweak. She has provided me with Blocked-Buzz exercises to try to get the "old" feel back and to analyze my embouchure. Not sure if you have ever seen that (it is on her website) but wondered if you could weigh in on this. I think my biggest problem is swelling of the lower lip. Due to a cross bite, I've always played a little off center towards my right hand side (maybe I've drifted off even more, not sure). Well I've noticed over this time that a slight puffiness of the lower lip develops after playing (doesn't take long) and when that happens, everything seems to shut down and playing is a struggle. Range, endurance, control all gone. I'm not sure how to correct this but I think it is essential if I ever want to get back on track again. I thought maybe you could help with some thoughts, suggestions, etc. Darth