I'm having the same issue as the last few posters. Finished farming up the IV guide set completely on my Hardcore Seasonal character. Extremely strong for a brief window of time but even with gems and enchants I cant seem to maintain CotA 100% uptime unless I get an insanely dense rift.
This leaves me with on average around 25% of CotA off cooldown where I have basically zero fury generation and I turn extremely squishy because I'm losing the 50% damage tanking from my CotA friends.
I'm not super high paragon yet, 200ish, but yeah the build seems too volatile for me at least in hardc
