As someone already know, T-grain films of course need twice the fixing as non T-grain to be on the safe side.
This is why I always use pieces of T-Max film (TMY-2) to do all my clip tests for clearing time.
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
I had a theory that any dust particles that might have found their way into processing solutions would tend to stick less to the emulsion if there was sufficient agitation, particularly during the beginning of fixing when the emulsion was still a bit soft. I don't know if it's true, but I have been very free of dust stuck to my negatives.