Spiritbond

I'm working on Spiritbonding gear while I wait for dungeons, and I have a few questions.

1. Goes each piece of gear have a numerical value (ex. helm has 1000 points)
2. Does each mob give varying amounts of points?
3. Does level matter? (Higher level filling gauge faster)
4. Does spiritbond depend on EXP? (IE A monster that gives 2000 EXP fills spiritbond faster than a mob with 1000 EXP?)

Could I travel outside one of the city-states, tag a bunch of mobs, and AoE them to death, would that charge my spiritbond, or only monsters that give EXP?

*bump*

Anyone have any advice for this? I'm fighting mobs in crafting gear to spritbond that into Crafter materia. I wanna come up with a strategy that fits my playstyle, but I don't really know the specifics of spritbonding.

I've done some dedicated spiritbonding of jewelry items (have goldsmith 50) and my observations so far:

1. Item slot doesn't seem to matter as far as the rate goes (at least between the various jewelry slots)
2/4: Spiritbond progresses from monster kill XP, gather item XP, or craft item XP values (and seemingly nothing else. FATE, dungeon completion XP, or quest/leve reward XP don't move it)
3: Higher item level takes more XP to spiritbond