I agree with Canibehealz’s assessment of the 4 set. I was lucky enough (for once) to get my 4 set the very first week on NH. I run EoE with my HST and average about 20 casts durring a 6 min encounter. This number could be higher but I don’t run HST 100%. when the raid is topped off, as I prefer to conserve my mana and spot heal or dps. However considering that HST heals an average of 1M+ per cast, losing a few of our preferred stats to double its up time is a win win for sure.
Logs posted as reference. https://www.warcraftlogs.com/reports/qYpTHAWbQhxDVd7F/#type=healing&fight=7&source=9