Great thread, looking forward to reading it through.
Interesting word "garnish", I think of these simple trailing surfaces as trim tabs. I build and fly models of several sorts, R/C and F/F -- the most critical designs are the rubber powered indoor models, and temporary trim tabs are sometimes used when trying out a new one which is out of trim.
So it sounds like you got and liked a fair amount of negative lift as a benefit towards traction.
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