There's one way around all this. If one would like to reduce intermittency, but not to its entirety, then follow Matt's advice. If you make a test strip at f/8 exposing 32-16-8-4-2-1-1. You could expose at f/16 for 128-64-32-16-8-4-4. At the longer times the amount of affectation on the halides would be the same, however much less noticeable.
Given that this would be a stupidly long exposure time to make a test print, don't do it.
Ralph is pointing out information to get the OP down the correct path to learning about his topic if questioning.