Maybe I should have been clearer. I know Min Bias has nothing to do with dynamics. The little black artefacts in the top image posted look like they could be the kind of artefacts you'll get on any mesh in Poser with a very low Shadow Min Bias on a light - individual polys casting their own shadows.

Whether that is the issue here I'm not sure, but I've had something that looked similar in my own renders a few times, and that was the culprit.

If Min Bias is the problem, it could also be exacerbated by the jaggies that will result from using a regular grid mesh as a dynamic item.

So in short I think this is primarily a lighting issue, though I could be wrong ;)

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