General

The same logic would work for a mage who wants to have stance in the game, except you would stack blind skill in your equip and weapon potentials with each piece granting at least 10%, that is if you want high stance as a mage, but I haven't tested this out on bosses, just regular mobs: Get your character to lvl 130, and use a weapon with lvl 1 10% blind chance on monster and then go to three maps left of showa town where the flying 4k hitting ghosts are. they have alot of exp that they give compared to leafre or cbd, and they also drop helmet for int, which always will cost alot in the fm when the customers want to buy int equips for pun intended reasons. And the blind that you got on your potential on your weapon will allow your warriors, or warrior-like characters you play have a guard signaled on it so that it dodges, like the thief, more attacks from the 4k-damage dealing ghosts that you lured in packs to the bottom left of the screen where you can see the drops of the ones you killed in packs, instead of how the rest of the map cloaks the drops so that they disappear if you don't have a pet. The blind 10% chance of working will be based on how many attacks, so if your one attack as let's say 6 attacks in one go, you will be guarded more often than a one-hit skill like assualt for chief bandit. The guard is what the jaguar-sitting hunters see on their screen because blind is their dexerity(just dexterity as in the monster missing you) skill. lvl 10 blind on a weapon's potential is easy to just find from a drop because it is just a regular, or not even epic pot if i remember correctly. And with this tactic I told you, you can train your lvl 130-150 as if you were barely lvl 60 and training at a regular monster map that gives good exp for its' level, except you happen to be lvl 130+. Have fun! That's all I could help with.

Ideally, you want to balance around 200-250% Boss Damage and somewhere around 90%+ PDR. After that, pump whatever else you can into Magic Attack.

Depends on your current stats, you should probably just keep whatever 3 line mix of % magic attack and boss (maybe ignore def). keep what you have, later when your other equips are done you can calculate what mixture of the three is best.