As Ted said, TMX has very high resolution, but very low apparent sharpness if care is not taken. TMX has a thick hardened plain gelatin layer covering emulsion, so it is hard to stain in tanning developers. I think dedicated users of PMK and other tanning developing agents generally prefer FP4+ and HP5+ among other non T-grain films. However, I don't use tanning formulae in regular basis, I can't comment much on it.Again as Ted said, Gainer's Vitamin C formula is a good one for TMX. I consider Gainer formula a drastically modified version of FX-1 or FX-2. I've been using the following formula, which is also a drastically modified version of buffered FX-1 or ascorbate version of dilute DK-50 suggested in British Journal of Photography, as printed in Anchell and Troop.
L-ascorbic acid 1.0g
metol 0.4g
sodium sulfite 20g
sodium carbonate (monohydrate) 4.0g
sodium bicarbonate 1.0g
water to make 1.0 liter
If you don't have any sodium carbonate, cook baking soda in an enameled pot until the sticky feeling is lost, and use 3g of it instead of 4g, as it is sodium carbonate in anhydrous form. So this is pretty inexpensive and easy-to-make formula, although it's not as cheap or simple as Gainer's.
I haven't tried, but in this formula, sodium ascorbate may be substituted for ascorbic acid without much adjustment in processing time because the developer is rather well buffered. I process TMX for 8.5 min to 9.0 min at 20C at EI 100.
With this formula, TMX gives much sharper images than in D-76Ad 1+1 but without undesirable grain or speed penalty. Shadow separation is excellent, and tonal rendition is pretty good. I think this formula has pretty good potential as a general purpose developer, but I haven't tested much with APX25 or HP5+. Since this shouldn't be too differnt from Ilfosol-S type formula, I also want to try this with Delta 3200 at EI 1600, and with Delta 400 at EI 400 to 800. (inspired by John Hicks' postings here a few weeks back)