Goodness knows how I recall this, but I read this article a number of years ago regarding AoA readout installation in Boeing Aero:
So, if the approaches were flown on a daily basis by reference to a fixed-approach AOA based on a margin above stall, at any CG aft of the forward limit, the probability of tail strike would be greater than the current practice of using approach airspeeds.
Full article:
Aero 12 - Angle of Attack