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Under summary there is a text link to rotate the index manually

BUT, if you have a sponsor with thousands of galleries and several other sponsors that have far fewer galleries the bulk of your thumbs will still come from that one sponsor. The best bet is to go through the sponsor and remove any duplicates or crappy thumbs. Time consuming but smart thumbs is not very forgiving sometimes.

Also worth a try is to change the rating weight of sponsors that have fewer galleries. This way if the thumbs rank the same the ones from the sponsor with less will rise higher to the top creating the perception of a better mix.