Hi OK465
Let's see if we can put together some sort of explanation that will reconcile what we have.
Bearing in mind that your original question related to full ND in a developed stall.
If the system gains default to 330 kts values then full ND SS will give an initial elevator deflection of about 4 degrees at all speeds.
If the aircraft were genuinely at 330 kts this would be just about right to produce a delta gee of 2.0 taking the aircraft to the manoeuvre limit of -1g.
If the aircraft was in a developed stall (say 155 kts) then this elevator would, using back of envelope scaling, give a delta gee of only - 0.44.
The system would then see that this result did not conform to the expected delta gee which goes with the SS position and would apply additional ND elevator until it got a match or the elevator hit the stops.
If you cut off your observations before this second phase came into play then you would only see about 1/4 ND elevator applied.
Had you let things develop then you would have seen bigger deflections which would be consistent with what I saw on the other simulations.
If the elevator were deflected to full travel (15 deg ND) then the available delta gee would have been about - 0.75 until the THS started to move.
Does this make sense?