I'm currently hunting in Cazic Thule gators. Every mob is ensnared. I buffed my one gator with Brambles and Feral Spirit. He turned into a killing machine and started destroying gators one at a time. I never had aggro on more than one gator besides my charm pet at a time.
When they got below 10%, I back off my pet and he immediately stops attacking. I now ensnare a new target and engage and repeat the process. In the below screenshot, my pet finally got low himself, so I broke and killed him with Careless Lightning.
On the screenshot below, each of those gators is below 10% and fleeing from me, waiting to be melee'd down which I did right after taking this screenshot before writing this post.
This is far more efficient than what I was doing before for sure.
EDIT: Also wanted to add that the HP regen for these mobs is extremely low and not at all a factor. By the time I killed my charm pet, the original mob had healed maybe 3-4%. I would need to worry about refreshing ensnare long before I had to worry about them re-engaging me above 20%.
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