Pulverize/Cata Druid support

https://maxroll.gg/d4/build-guides/cataclysm-druid-build-guide#faq-mechanics-header

This is my current build I have been following. Doing pretty well. In Torment 4 and handle hell tides easily and can kill end game bosses at a decent rate. I wanted to ask if anyone has experience with this build because I am struggling at Pit 70. I can complete it but its not easy. Usually have about 3 minutes left on the clock when I get to boss. I currently have Cata CD at 24 seconds, 3k overpower, and 3500 Willpower. I know I need to get the cooldown a little lower but I feel like the DMG output has fallen off a bit and im struggling. Also my crit is only 30% chance and about 650 DMG. Any help would be great thanks in advance.