Really Great Thread....
A well thought out experiment, not just a thought experiment, but an experiential experiment, which definitely can weed out the wishful thinking.
I identify with your experience concerning too much contour in the handle. I have a Spyderco Hossom Woodlander, and just from playing with it, I knew the curves were too much, I masked them with grip tape. It is an interesting continuum, where sometimes that which looks good, is no good. BTW - That Delta 5 looks nice. Just last night, I was playing with a friend's drop point, and I found it to be too round, I could tell that my hand would fatigue if I had to use it for any period of time.
Also, I know that there are a bunch of thoughts, theories, opinions, 'facts' and other statistics out there concerning the double bit vs the axe vs the big knife. I am not going to hijack this thread, but if you are interested, I am going to start a new thread.
Marion