A320 C.G Being Less Than 25% ...Question

[Dani]

A wealth of questions... - I try:

1. Different operators handle the 25% increment differently. Obviously that's approved by AI. We e.g. used the imcrement only from 27% on.
   
2. The "wrong" trimwheel setting certainly also has to do with the "FMGC vs. FAC" mistery: Both do not show the same weights (FMGC derived from pilots input, FAC from AOA).
3. I cannot completly follow your "mental calculation" but I presume that the imcrement is a safety margin in tailheavy configuration. As we all know most aircraft are more stable when they are nose heavy.
4. I doubt the story about FAC loss. If you loose FACs you fall very fast into alternate law, thus having a 10 kts increment. That's more of a realistic speed adjustment.

Any opinion on that?
Cheers,
Dani