That's a good question.
From Cathar's work, he found that a fin to channel ratio between 0.75 and 1.5 is about ideal (given some specific conditions/parameters, i.e. water as a fluid, I think...).
I considered saw blades for my block. Morphling1 actually uses them.
"Too small" is when the spacing is so tight that the hydraulic resistance is relatively the same, regardless of the fin height, but I don't think that 1/32 is anywhere near that.
It might be a good idea to run some calcs, with different flow rates.
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