I am using at least 5 wraps each time. In fact the knot seems to weaken if I go more.
I've tied so many of these knots over the last 48 hours that I can stack the barrel straight enough to take micron imagery of them to get them any straighter. I also use a little spit to ease the loops.
It's easy to speculate. I'd be interested to hear what people experience firsthand by testing them against each other. At the next show or clave, let's pit your best non-slip against mine to see which pops.
The evidence is overwhelming in my tests, and it's intuitively obvious to me that (1) doubling the jam knot and (2) improving the clasp is a significant improvement over "conventional wisdom".
I don't believe in luminaries, I believe in evidence.
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