Response to 4x5 B+W Blotchy Marks on Some Negs: Why? Help Please!

I suggest that you add a couple of drops of Edwal LFN wetting agent to the presoak. It sounds like you may be developing your film emulsion side down and there are air bubbles trapped underneath some of the films. I develop six sheets at a time, emulsion side up, and rotate through the stack every 30 seconds. It is easy to do six at a time this way. In addition, my development times for sheet film and roll film are the same, agitating 5 seconds every 30 seconds in tanks.

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