What you have to do b/c of the spell lag is preemptively move before they come. You need to know what's coming next. And if you happen to forget what's next. It's probably plumes. SO just start moving. If you are moving before the plumes come, you are 99% more likely to not even be in one when they sprout. I had to learn the fight this way. Is it annoying. Yes. It isn't an easy fight, but if you can just be moving before he casts, you are gonna dodge everything.