Newton ring issues in glass carriers? Yes, that is an issue, and is why I use carriers with Anti-Newton glass on both sides. And yes, TMax 100 is disappointing in terms of edge acutance in common developers. It holds tremendous detail, but the Mackie line effect is poor in comparison to its big brother TMY400, which has excellent edge effect. That softer edge rendering can be a real plus in portraiture, but a minus in things like landscape rendering. I know how to dramatically improve edge contrast with a certain developer tweak which I don't have time to explain now - it's on previous TMax-related threads.
It wasn't necessarily formulated for D76 at all. That's a myth. Yes, they were marketed together as a convenience concept, because 76 was readily available and their own product, and sorta a middle-of-the-road developer. But as I stated earlier, TMX was engineered for multiple applications at once, some of them technical, forensic, and in relation to advanced color processes like dye transfer no longer available. Therefore, there were technical recommendations for other developers too, including their own TMax and TMax RS developers intended for better results than D76. But that's another story for another time.