NIce write-up, but as far as shell fitting goes you may want to add that it's easy to guestimate that inch of space (1.5 inches seems a bit much) but using your fingers. If you can slid two fingers behing your heel (stacked on top of eachother, not side by side) that's about an inch, and that's a comfy fit. If you want a snug fit, a little more than one finger will provide that for you.
Also, if you're going with head mold liners, go with Intuition. Also note that not all Intuition liners are the same. For example, Scarpa makes a Universal Intuition liner that is not the same as the liner that comes in a Spirit 4 boot. Same goes with Dalbello, they have their Gold/Silver etc. liners. Be sure to get the best liner you can, and fit your boot SNUG and get them heated up and make sure your boot fitter has you wearing foam or plastic toe cups over your toes.
I've fitted quite a few pairs of Scarpa and Dalbello boots with Intuition liners, and I'm not a boot fitter, but my customers love the fit of their boots. From what I've tried on myself, too, Dalbello boots are extremely comfortable with the Gold Intuition liner, and I'd recommend them to anyone who wants a pair of boots that'll last them for years.