More spotting on Tri-X

In a previous post, I've questioned why exactly I'm getting spots on Tri-X. In that post, I received some great replies and ideas. I concluded that an extreme temperature increase caused the spotting and/or grain reticulation. Upon further investigation(strictly monitoring temperates, times, etc.) I've concluded that the spotting may have been due to rust in my rinse water. I have taken the advice of others and thrown away my film squeegee. I now do a final rinse of the film in a very dilute solution of photoflo in distilled water and air dry. Results are excellent with other films. I have also purchased a filter system for my water source and plan to experiment further. My confustion lies in the fact that I don't get any spotting on either TMX, TMY, or Delta 100/400. Is there something different about TX emulsion that is more sensisitive to rust? Thanks in advance-Paul.

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