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"My problem is that the disks are out of whack when the jaw is closed and as such my jaw sits at a wonky angle and the muscles seem to be permanently tight."

Of COURSE they are... you suggested you are obsessing, overthinking and STRESSING about it. I'm pretty sure this is probably not the only part of life you stress. You are also totally TMS-ing that your case must be different than any other person who has pain. No, I am not going to ask my dentist about your pain, that's just totally so obsessive - why on earth would I ask my dentist about some stranger's symptoms on an internet forum. Your brain is just really swirling and whirling and anxious. This is 100% anxiety.
Claire Weekes is your anxiety friend. Her book Hope and Help for your nerves gives exact and precise directions on how to deal with anxious thoughts. Thoughts are just thoughts they are not truths.
Symptoms and anxiety just don't magically switch off, you need to do the work. You can read every book and look at every program, but there is a level of being totally and brutally honest and vulnerable with yourself that it takes to heal (on top of knowledge).

You've done a wonderful job with healing other TMS symptoms...and sometimes when there is more work to be done those old symptoms really don't quite leave - they move around to places where your brain KNOWS it's got your attention. It has you believing that some teensy little discs in your jaw are wreaking havoc on your entire body. It is controlling your thoughts. Why are you letting it? Honestly, that's the simple truth of it. Your brain is not the commander of your thoughts...YOU are (and that's pretty awesome). It's about education, and choosing what and how you are going to believe.

"but I just can't get around it at the moment"

The best thing about that phrase is "at the moment". Why "can't" you? It is certainly not impossible, and you've actually proven it IS possible in the past!

When you did the "work" to heal in the past, did you work with your anxiety, your thoughts, emotions, beliefs?