Great illustrations! One nitpick, though - I don't think asym tarps require you to sleep inline with the tarp...you just have to go on the diagonal to the side where the tarp has more coverage. But it's still diagonal, and not inline with the tarp's ridgeline. Maybe a better way to word it?
Good observation. Yes, I'll re-word that. You mentioned what I was getting at, but the words got in the way.
Something like this?
"With an a-sym tarp, you need to sleep on the diagonal, for maximum coverage."