I haven't used TMX in years, just never liked its "mechanical" look although otherwise it was ok. I used Rodinal 1:50 for EI 64 or so.(posted 8945 days ago)Anyway...to pull down the high end I'd try high-dilution Rodinal, D-76 1:3 or D-23 for about 2/3 the normal time followed by a borax bath. Note: with Rodinal if the EI gets way too low, add about 10-15g/L sodium sulfite to get 1/3 to 2/3 stop back.
Something else just came to mind; I believe John Sexton used T-Max dev at something like 1:15 to get a wide range with TMX without losing lots of speed. You might try that or maybe DD-X at significantly higher than specified dilutions.
Phil Davis' DI-13 is available from Photographers Formulary; it's intended for contraction or perhaps normal negs with TMX only and may help. I've never seen the formula for it.
Modern films stubbornly resist efforts to modify curve shape. Generally it's a straight line of at least 15 stops; that highlight contrast can be a bear to print. While it's easy to lower the CI (which may really be all you need to do) it mighty difficult to put a shoulder into them.
I don't know exactly what it is about TMX that I don't like...it's just kinda odd, but I grew up on Tri-X....
I use Delta 100 in D-76 1:1 or 1:3 for a medium-speed film.