New here, but not to multiboxing. Here are my D3 setups :)

[Cmoidudu]

GR 47 completed with a lot of pain.

I can do GR 45 all the time, and then suddenly at 47 everything hurts so much... I switched one of my epic DPS gems for Molten Wildbeest's with 52k life/s regen on all my characters, and that helps a lot. Instant dps is down, but overall dps is the same, since I die less. With the 48k life/s area heal of Consecration + Bathed in Light (almost always up on my Shield Bash dude), that's a 100k life/s so I'm fine with that most of the time, assuming I don't get one-shot.

Also, Akarat's Champion + Prophet + 68 stacks of Taeguk (the whole being up all the time on my 2x Condemn dudes) is really superior to Iron Skin + Steel Skin (up all the time on my Shield Bash dude). But the Condemn dudes are amost useless on the Rift Guardian so...

Speaking of Rift Guardians, I met the rat-lord-what's-his-name-again and good luck with this one. Ouch. Also Raiziel now has clones, so he was a cool Rift Guardian before, and now he hurts a lot. He still doesn't have a lot of life however.

Maybe I can push to GR48 with a "good" dungeon and Rift Boss, but this is probably the best I can do with this setup. I can still improve my gear, but not that much.