Herald of Ash Explode vs Greater Devour uptime help

I just respecced my Necro and threw together an EK (hit based) Elementalist, my priority was to utilize Corpse Pact FF jewels combined with Greater Devour Support to get free 200% Cast Speed and free Soul Eater as well. The problem is that it feels like the Soul Eater and Corpse Pact uptime are really lacking and it's likely due to explosions from Herald of Ash. It's really bad, like 1 or 2 stacks of Soul Eater at a time. Any tips to solve this, or suggestions in general for the build are appreciated!

https://pobb.in/5fDciw5heiNg