I like tray developing but get so many scratches and dings on the negs, even after practicing a whole year I cannot get scratch free negatives. And that's with FP4 and Tri-X film. Drives me nuts...
I've done tray too and getting scratches and dings. Then someone pointed me to the directions on viewcamera.com. The directions was for doing the negs with the EMULSION side down! I tried it and I thought for sure I'd get scratches due to the bottom of the tray. Completely the opposite of how I learned.
I don't get scratches anymore after doing it that way.