I've nere used powdered fixer, but I've had some good results developing Tri-X in HC110 dilution d, 6 minutes at 71F, stop x 30 seconds, then fix in Kodak rapid fix+hardener for 2.5 minutes, then fully rinse 10-12 times, add 2-3 drops of PhotoFlo, then rinse another 12 times and hang to dry in a relatively dust-free environment.(posted 9000 days ago)This process has yielded clear negatives, with nice tones.
Asher