I'd also try a smaller bucket size. I frequently have to turn mine all down to 16 when doing pictures with more than one character in them (and that's with a shading rate at 0,1)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.