Imho, don't map to l-click. what if you want to mark a demonhost? or just wasting ammo. you'd need to swap to melee first every time.
I have mouse 4 for that.
I put crouch on c. dodge to shift.
Burster push is going to vary with weapon mobility, stagger power.
And yeah, had a 4+ demonhost run last night in a dark mission. was on my zealot alt. so only t2, everyone was rank 2-9. 2 ogryn, me zealot, iirc 4th was a vet. I want to say it was the vet, that attacked it EVERY time.
I don't remember if either ogryn had a shield. Both did know how to block/dodge either way. and of course so did I. I did also have a flamer, so when it wasn't on me, I just burned it down fast. First one killed one of us, while I had to take out the horde that came. Then I tanked it, while the ogryn killed it.