Until you get better equipment, one that will help a lot is Minikin Monstrosity. It gives 10 mp/tick refresh, among other things. It drops from Durinn, which people will sometimes farm for AF3+2 items. So you might have luck finding a group that way.
Ultimately, the ones you'll want to have are:
For physical damage: Razed Ruins, Voracious Violet, Gnarled Horn
For magical damage: Ultimate, Beyond, Minikin Monstrosity
For solo: Ducal Guard, maybe Mounted Champion
Note that Ducal Guard is a quested atma, it requires fame which isn't too terrible to obtain. Ducal Guard makes your avatar **** near invincible. Also, Ultimate is a synthetic atma, meaning that all you need is a certain title in order to purchase it for cruor. In the case of Ultimate, you need to kill Proto-Ultima in Limbus. Once you do that, the option to buy Atma of the Ultimate will be available. All the other atmas I listed are obtained from killing stuff in Abyssea, and often will only drop if you trigger red weakness.
____________________________Pergatory (Asura, Kupo LS) WHM99 ~ SMN99 ~ DRK99 "If you want to know me, look inside your heart." -Lao Tzu