I still favor a three plate design. Don't have any 3d modeling software, so you'll have to bear with my explanation, but consider if you moved the barbs closer to eachother, on the top plate, then milled the center plate (reasonably thick middle plate, probably 1/2") halfway down in a fanning out pattern from the barb to the edge, then milled all the way through in a channel over the edge of the channels... I am pretty sure this would encourage greater flow across the other channels.
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If not, why not?
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