PMK and tri-x are a great combination. Expose the heck out of the trix if you want rich detail in the shadow. The highlights will not blow out - this is the beauty of PMK. I expose mine at 160 asa for optimal results. Definitely use distilled water for both dev. and prewash as PMK does not play well with most tap water. I have noticed more staining at higher temps but the 75 degrees f. that the digital truth devchart recommends strikes me as excessive. I use 70 degrees f. at 12 minutes, one brisk total inversion every ten seconds throughout the entire dev. time. Try to find yourself an alkaline fix instead of an acid fix as the acid fix will wash out much of the stain. Prepare yourself for the most beautiful highlight rendition you've ever seen in your prints. Have fun!