Kona Tom... I have a Miramar and always had this same problem when I leveled coach perfectly side to side. It seems the slight angle of the holding tank allowed the liquids to flow to the deep end but no the solids. I found setting my auto levelers to be slightly lower on the driver's side gave just enough additional slope to the holding tank everything flowed well as long as I used a bowl full of water with the flush. No more moving it around with a stick. (yuck). A side benefit is the AC always runs off the driver's side... Away from us.
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