Not sure if this has been mentioned before, but does anyone think it would be a good idea to have materia that increases your Spiritbond Gain? For instance:
Spiritbond Materia I = Spiritbond Gain +1
Spiritbond Materia II = Spiritbond Gain +2
Spiritbond Materia III = Spiritbond Gain +3
Spiritbond Materia IV = Spiritbond Gain +4
It's been pretty much determined a gain of +1 = 1% increase in spiritbonding. However, the pieces of gear (head, necklace, earrings, rings, and wrist) that have the Spiritbond Gain on them doesn't help if your goal is to spiritbond alots of gear in an effort to convert it hoping you get level IV materia.
continued below...