Nah, doesn't matter. Opened on rogue, got rogue golden cupid wings. Finally.

There seem to be times when you get a chest every time and periods of when you get none. I just keep going and eventually chests start dropping again. At least solo, I can see if there's a chest or not before he completely falls and start heading out.

Yes, drag the troll to portal area for whole fight or when he's about to die is good. Stunning him when he does his small full red circle is good -- no slow puddle under him. Or give him his love elixir when his life is a little bit down and he'll be stunned the whole time above/near his death portal.

I can do 1 troll/minute (possibly less). I started soloing after I had to wait for the troll to amble his way up from where other people had dragged him.

I'm really enjoying the Lovecraft event. It seems to have a little bit of everything for everybody. And the vanities are great!