Thanks for sharing this. I haven't gone to the PTR yet to try it because I think it will likely be changed.

I hav an idea. Why not put all your toons in a circle, facing toward the center. Then you don't move at all and just spam (in order) 2 (throw spear), 1 (melee blow) and 4 (shield up). This way if your toon is far from the target, will throw the spear, damaging a lot, if he is close enough, he will melee and shield up.
This should make a quick work of the trash. For the big ones..as soon as one dies you could move one of your toons of top of it for a quick trample.
Maybe it works?