I wouldn't be so quick to stop using hellfire. If you are concerned about argo, let consecration tic a bit more. Otherwise, you could work holy nova into your rotation a bit more, as in every button push. Mobs will die faster, via holy nova damage and hellfire. The downside: you have to drink, but that should be compensated by the faster kills and the fact you can summon your own water.

One of my set-ups is pally, priest, and 3 x locks. At least in my experience, hellfire owns. If you let your tank get a bit of argo, by the time hellfire pulls argo, they will pretty much be dead anyway.