Ideal group for T6 farming.

[MultiBear]

This isn't an answer to your question, but just something I wanted to mention given you stated you're boosting characters through story mode to unlock adventure mode. Unless I misunderstood what you're doing, there is a trick that might save you a lot of time.

The way I did this is to have a character on my original account start the quest for killing Maltheus, and have the other three join that. One boss kill later, adventure mode was unlocked for the three accounts I had added, without the need to go through the entire story on those accounts. Mind you, that was on Normal difficulty and you'll still be required to get characters to level 60 on the new accounts in order to unlock higher difficulties.