Larry,
These tests were all very interesting!
I for one had been told years ago that banked away was best. Good to see the actual evidence to the contrary.
Whilst looking at these tests, my mind kept wandering to the late English locks, with Vee-shaped and "U" shaped pans, and the reasoning behind them. It seems the pan -cover had an adage on the under-side that kept the powder close, but not over the touchhole. (A lip often fitted that did not permit powder Quite up to the touchhole)
I think maybe they knew some things we are just finding out!
FWIW, decades ago I made such a piece and soldered it onto the lower side of the pan cover, it allowed prime very close but not covering the touchhole no matter how the gun was moved about or rotated. It worked well enough, but as you have demonstrated in these tests, no human can Really tell the difference!
Lock geometry and steel temper could possibly have more effect , good or bad, than touchhole placement.
Thank you again for linking these tests for us Larry.
Best,
R.