Shavemind, I believe I have stropped the keen-ness from the edges. I moved the height of my strop, and have attempted to keep it more level/straight (instead of twisting). The last couple of stropping sessions feel much better and I am avoiding the dreaded "Scraping" sound when stropping.

I believe my skin stretching is good.

The ATG pass, on my neck, just seems to be catching that much more hair - even better than a stretched WTG cheek pass or two. So all of this is leading me back to the shaving technique/blade maintenance...which is ultimately leading to poor stropping!