One point that I haven't seen raised up to now: The pivot point of the stab appears to be in the same location (relative to both the fuselage and the stab root chord) on the Classic, NG and Max (not sure about the -100/-200).
The NG/Max stab has a bigger area than the Classic stab, with about 5' greater span. That would result in both the CofP and CofG of the stab (presumably originally roughly in line with the pivot) moving further aft. Not by a huge amount, admittedly, but possibly enough to affect the manual trim forces at full AND/ANU?