I have two rolls of Tri-x at EI 1600. Rodinal 1:50 is my normal developer but when I used at regular times for the last Trix at 1600 I shot, I was disappointed. I want to use stand development. Would 1:50 be ok, (I have does this before) or would 1:100 be better. The 1:50 results were little less than ok. I have always heard 1:100 for stand development. Also, how many hours is usually best?