I recommend improving your GF's abilities so you can junction more items. also, i recommend junctioningall your gf's across your inplay party, rather then all characters.
[*]Best junction spread (so you get every character with the most abilites):
[*] Character #1
[*] Character #2
[*] Character #3
[*]CrispyMallow's Junction Spread theory:
Unless you have a different scoring system, I believe I have a better spread of GFs. If you assign one point for each possible junction/ability added above normal, there are 63 total points available (21 per character * 3 characters)
The GF configuration in your guide results in a total of 53/63 points, but there are ways to get 54 (the most possible with default GF abilities).
One such method is (Tonberry on any character):
[*]Quezacotl, Ifrit, Siren, Cerberus, Cactuar
[*]Shiva, Diablos, Leviathan, Pandemona, Doomtrain
[*]Brothers, Carbuncle, Alexander, Bahamut, Eden
which obtains a 54 score and minimizes variance (exactly 18/character).