<p>I wouldn't think pre-soak would affect grain. Sometimes you need a little more developing time if you have pre-soaked, as the developer is slightly more diluted at first. Your 9 minutes is the recommended time in D-76, and you don't comment on density, so I assume it's OK. Did you develop previous MinoPan in D-76? I use a finer grain developer for my Minox, used to be Microdol-X, which I'm running out of. I now use Ilford Microphen at 1:1 You co with, I think, good results.<br>
Another thought would be temperature changes during processing. Could be some reticulation in addition to grain. You could also try the D-76 at 1:1 or 1:3, which may give less grain. Let us know.</p>