I believe that your problem is due to FAC's of
as they are used to calculate Stalling speed you don't have any more this computation so only AOA devices trigger the stall warning without anticipation
Originally Posted by
tdehuya
I dont understand on the sim,why there still have vsw and red/black
indication on the PFD after both FACs turned to off
from FCOM-DSC-22 40 30-Flight Envelope Function-General
"As long as one Flight Augmentation Computer (FAC) is valid, it governs the flight envelope function, the rudder position display, and the rudder trim indication regardless of what the flight crew does with the FAC pushbutton."
...different story when you pull both CBs