As far as I'm aware your consideration when changing the cruise C of G is that you will change maneuver margins, Opt and Max alts. This is graphicly displayed on a speed tape or MASI. Our FMC software on the -800 is U10.3, the default cruise C of G is 5%. I maybe totally wrong (Pls correct me) but believe/heard, that this was to be left alone. A possibility I guess as the CAA maneuver margins are fixed at 1.3G or if you prefer 39 degrees of bank.
Best Rgds
[This message has been edited by Slick (edited 12 June 2001).]