Yea. Also, my second and third level 70s (Mercedes and Demon Slayer are the first I've managed to get there within a few weeks without spending more money to level than would be feasible (good mules gain money for my bishop to brew more pots), as was the case both with Warrior and Aran, not to mention some of the archers).
Okay, then it's pretty much as I said. Use HolyShield whenever possible, have MG on and plenty of hp/mp equips (these help because 80% reduction will still kill you if you have suck 20% hp), and use ginger ales whenever you run low (watch out for 1/1 as they like to try to follow it up with an attack) or get stunned or think you're gonna die because of mobs. Make sure you have invincible and bless on to minimize damage and maximize attack. This took about five tries to work out the exact strategy, but it works on both. I found Griffey a bit harder of the two, because it was slightly faster on followup and had stronger mobs.
Arcane Aim seems to be helping my SR more than BB (I tried fake Arkarium and managed it easier with SR than with BB in terms of steady damage), so I'll likely raise that as much as possible, along with Buff Mastery and Adv Bless, before trying with BB, Bahamut, and the others.