There's nothing wrong with dealing more damage with a RAV, and since they're usually survivable enough anyways using Mana items are preferred. Vitality items really only work well with the SEN role since they're never going to use counter-attacks when you want them to anyways.
I'm not sure, but it might be so little that it's very easy to miss. I never paid too much attention to it.
As for going all-VIT instead of all-Mana on Ravager monsters, it depends. All-VIT will give you higher survivability for them, but it cuts down on your damage - and in this game, offensive is better than defensive fighting. I tries to use all-Mana on Cloudburst, but towards the last levels I really didn't feel up to collecting them so I went for VIT and the damage is still decent enough. The HP I don't take much note of, mostly because with offensive fighting (and proper strategy), most battles won't last long enough to worry about HP of the party.
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Monster Materials to Use: Power for levels 2-10, 30, and 41-99. Potent for levels 11-29 and 31-40."
I'm not fond of balanced or jack-of-all-trades RPG characters. It's either a pure attacker, pure mage, or full-on tank. My question is, why Potent? And why at those certain levels? I Why not go all-power with the Choco? Doesn't Potent waste points on Magic?
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Read through the build threads. This Noah guy noted that magic somewhat adds a small percentage to chaining.
Make sure you understand what those levels actually mean. It isn't intuitive. Read the beginning of the monster builds section for details.
Cloudburst can end up with a lot of HP if built for it. I'm not sold on the idea since it just isn't necessary in general, but I suspect it has some merit. Definitely go with Mana for playing through the game if you want to optimize.
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