Timing shaman epic dot for root rotting

[gseiomfmfornesy]

Hello!
I decided to reinstall p99 after a good few years away and I noticed that there is no longer any text for the damage ticks of the shaman epic to help manage timing for root rotting. I used to be able to juggle a handful of mobs just by timing my enstill with a specific amount of damage from the epic dot, but I've been struggling to dial in the timing now.
Does anyone have any tips for timing the epic dot?
Sorry if this topic has been covered but I wasn't able to find any info through searching.