How to use Corvus in 6.3 and 6.4?

I recently pulled a 5 star Corvus and I'm loving playing him. But one thing I thought about is how Corvus fares in Act 6.3 and 6.4 because of the massive healthpools. Do you just dispense of your charges and then just dance around and wait to get them back until you build up your persistent charges? How highly do I need to have him ranked, rank 4 or rank 5? I don't run suicides.
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ML - parry gets you 2 sp2 before you’re out of charges and that’s usually enough to deal with the opponent on 0 charges, definitely once he’s got charges.
If you use Corvus take him to r5 for sure.
Congrats on the pull and good luck in act 6