Another thing about stab trim may have been forgotten...
Boeing reduced the diameter of the manual trim wheel on the NG and Max by 10%. That's ten percent less leverage on a stabiliser also farther aft than it was on the classic. The change was needed because the old wheel (200 and classics) didn’t fit with the change to the avionics.
A colleague told me yesterday that in the NG sim* with a gross mistrim even the electric trim wouldn’t run and they had to aerodynamically unload to get the trim to move at all.
Regarding the stick shaker...a single shaker does shake both sides, but its more vigorous and louder on the affected side. (Really loud, in fact)