PJ2
twenty years ago when checking out on the A320, one of the instructors observed that because the system maintains 1g, that it would gradually increase elevator deflection in the climb to cruise altitudes (where gravity is very slightly less, was the claim...), to maintain 1g and that a tiny ND input was required during the climb.
I'm entirely with HN39 on this one. Presumably your instructor was suggesting that since gravity is very slightly less the effective "weight" would be less leading to a slightly lower lift coefficient and therefore less up elevator needed.
Good theory, but in practice entirely swamped by all the other effects listed by HN39. I would add another one - if you are in gums' Viper or were in Concorde then the direction of flight (E/W or W/E) could also have an effect
