1: Yes. Pooling Berserk in your opener is a DPS loss, even if it gets you the 3x FC. You're better off with something like:

Vengeance + RI -> HS -> BS -> Maim -> IR + Berserk -> SE -> Pot -> Fracture -> HS -> FC -> Infuriate -> FC -> Maim -> SE -> BS -> HS -> Maim/SS (SS if you've got Minuet, Maim if you don't)

There's also the 3x FC opener that only pools berserk for 4 GCDs:

Infuriate -> Vengeance @ 1s -> pull >11s -> HS -> Maim -> BS -> SE -> Pot -> HS -> IR + Berserk -> FC -> Infuriate -> FC -> RI -> SS -> BB -> HS -> Maim -> BS -> SE -> Fracture -> FC

And other variations. But you definitely want to put up Eye instead of Path first, unless you just misremembered in which case... carry on. ( ' - ' )b

2: If you can get 3+ Berserks off it's better to use IR on CD, if you can only get 2 then you want to combine it with Berserk. I think Infuriate is best used for 3x FC, though I'm not 100% positive on that, just what I use it for.