Charming: Keeping pet and mob health equal?

[HerdeDaWord]

I've been soloing as a chanter to level 51 and I am really just now finding this to be a problem.

In previous zones I could tell which mob was a higher level or a tougher mob and I'd charm the weaker mob and use slow to keep their HP dropping at the same rate to make finishing them off easier.

My problem is that in the zone I'm in now all the mobs have the same name, look the same, and con the same but could have something like a 5 level variance. I can never tell which mob is the stronger one so sometimes I charm the higher level mob and it destroys the mob I'm fighting. I can't use slow to keep them even.

I've tried spamming the sit button and this seems to work a tiny bit but I always end up having to nuke the crap out of my pet after finishing off the mob and I'm wasting mana doing it.

Does anyone have a strategy for keeping the mob's and pet's health even when my charmed pet is smashing the mob?