I believe the basic problem is lift from the engine cowlings at high AoA in a turn with flaps up this I think pulls the CL in front of the C of G so the nose keeps pitching up.
I seem to remember Learjet had a problem with a T tail model that at high angel of attack could blank the tail so entering a deep stall, so required a stick shaker.
So to over come the problem they fitted under the rear fuselage what they called Delta Fins these at high AoA produced lift and pushed the nose down so no stick shaker or any other aid required. May be the fix the Max needs. Just a thought.