I love deadmines, ran it so many times back in vanilla that it was a new challenge running it with 4 level 10's. I'm not repeating anything new here but

- Make sure tank has high enough HP, I ran this with a new 80 pally with 17k hp, then again a few weeks later with 28k hp and it makes a big difference (especially in stockade)

- I usually make one of the slaves look back towards the entrance for any mobs and double-check his screen every 5-10 seconds

- Once in the cave with the boat, you can pull the ENTIRE room, I usually place the slaves on the mount to the right of the wooden concourse just after the entrance, pull every mob in the boat area and then run back. I try and stun and kill mr smite before killing everyone else otherwise I end up getting stunned myself.

You could also keep backtracking to kill the spawning mobs.