Salute!
Good stuff about the hinge point and the moments.
When I first saw a 737 next to my plane I thot it had a all-moving stabilator. The tiny elevator looked like a trim tab, heh heh
But when you start using that big stab for trim versus the "elevator", the pivot point of the stab and its use as a trim control surface is a big deal compared to the old days where it had a fixed incidence. Any really old dinosaurs here agree? In days or yore I knew at least one troop that tweaked the stab incidence in his Yankee to reduce the "trim drag" or reduce the downforce required to keep the nose up. He was leery of changing it more than a degree or two.
I predict the upcoming trials and maybe even FAA and other regulatory agencies will discuss the manual trim problem and bring into the discussion things like pivot points, jack screws, electric power to trim motor, and the beat goes on.
Gums sends...