Just a quick note about the T2/T4 magic spells that hit me when reading the last few posts. Avatars magic gets calculated completely differently from a BLM casting. They have considerably lower INT (though they may have roughly the same BASE MAB) than a BLM does at the same level. In order to compensate, you have to keep the avatar out smacking things around for TP. It's been documented that at 75, avatars have MAB4 trait and only around 82 INT--and virtually no gear readily available to enhance it like BLM, so you have to let them build TP to compensate. It takes 100TP just to get the .25 boost from TP or it's crap. Case in point, to hit 1k on a tier4, a my 90 SMN needs about +12 PET MAB and around 130TP in the calculation.
This isn't hypothetical either, I just completed a pet MAB staff and tested it with Thunder4 on firesday (no weather) last week. I am still rigged for physical on merits, but I was curious just how much the 5 pet MAB merits would affect my magic, but didn't want to dump and rebuild them only to have to reset them if I didn't like it--so I made the Pet MAB staff real quick (only took 2 afternoons to make it). I'm only 3/5 on callers +1 atm, so only had 396 skill with my neck off and have the 25% TP bonus from the legs. I fired off mana cede to give avatar a flat 100TP (no regain from neck) and it was consistently landing for 984 damage (bear in mind that is with a +25% TP bonus from legs to make it 125TP in the calculation) on bees right outside Jueno in Rolanberry. Output simply pales in comparison to any decently geared AH BLM.