Thanks for the comments and ideas.
Can someone please confirm these tactics are working post H&H patch, on multiplayer? Or even that you are able to kill him post H&H patch?
Looks like Sono has been the only one to kill him after H&H, so far.

Our issue seems to be that while we run to dodge attacks, he regens life ...so we can barely damage him to begin with. On top, when moving to avoid his meteor/lazer/whatever, we end up with 2-4 additional enemies on us, and die from that too. It really seems super unbalanced for 2 player MP.

He has destroyed all the fingers, our base, and everything nearby... There is no real way to avoid his attacks other than running, which leads to getting killed by a party of lox/fuelings/deathquitos ...and they do not take any damage from the boss' attacks, so...you are on fire, dodging, and being chased by say, two lox, a fueling and two deathsquitos ... :/

Thanks again for all the comments!