If they pull the next mobs then SS them when they are in combat or just forget about it. Low level dungeons don't really hit that hard, so the tanks just power on through. The tanks might like you to stay in Cleric longer as well so they get a faster run. Just make sure they have Protect up and keep any eye on the HP bars of everyone.

I don't like tanking for a group who is too slow. Too slow and too fast are both horrible ways to experience dungeons.