I have enough sustain that I can survive even on GR 90+, and I have enough damage output similar to the wastes set+Istvan's. My build above does not have mantle of the channeling, but given that I can get WotB up 98-99% of the time without the Bulkathos passive, I have Berserker rage and Brawler passives added instead.
I want to prove a point that the devs did not really buff the barbs last season with the wastes set changes, and only tricked us into believing so. If the IK set indeed performs the same with the Wastes set, then it would be equivalent to WDs having Helltooth at 2400% and Arachyr at 2400% which would not make any sense at all. I want to prove, with good examples, how Wastes needs a buff.
I have gone as far as augmenting the IK set + Istvan's, and comparing it to my augmented wastes + Istvan's in the live server, I don't see any difference at all.
Dunno if its normal or not on your ik setup that u have aquila cuirass, but then u forgot to add mantle of channeling in the wastes equation. Also wastes build gives dust rune, which gives extra damage and also extra targets to proc bleeding rune.
Btw might work for sure, but still wastes will be way more efficient.