Hello there,
first off i'm german ->please excuse my bad english. this is my first post i think and i hope it was not posted before.
me and my group found out how you can kill lockmaw without kiting or killing his adds! you also dont have to worry about Augh!
the trick is that you go on the crocodile statues behind him: you can simply run behind him without starting the fight and then jump on their tail.
two players go on each statue, one on the mouth and the other one on the stomach, because you won't get the poison on more than one player (it is beneficial if your melees step on the mouth because of their range). you'll bug the adds and they won't attack you!
if you only want to kill lockmaw, the tank has to stand between the two statues and than everybody damages lockmaw. when he is dead you run away and regenerate yourself (because augh spawns there).
if you want to get the achievment, your tank also goes on the crocodile and one other player gets on the floor with his mount and sometimes has to kite the adds (lockmaw will not reset then!). now your tank tries to get lockmaw on a position where it doesn't make damage to him (it was really time-consuming for us to find this position). if it won't work simply reset the boss (all players on the statue) and try again.
after you have done this, you can count the adds and if it are more than 20, you just jump down and AoE them (try to stun or slow them because they do much dmg).
i hope its not so difficult to understand and here is also an image of that
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