I also play Zerker on P1 or P3 (Not Pitzerker, only Trav), but only because its faster and easier. If I would be able to clear P8 as fast, I would do it - which is the whole point I make.
Trav is not the same as sniping elites.
And WW is way faster and easier, and you can hit 200 MF without too much problems if that is your preferred MF BP.
That's the whole point I make : P8 makes no difference in item drops compared to P1 with Zerk when sniping elites. They will give you a magic item in both cases. You just dont care about nodrop in this situation. And if you kill trash mobs then you don't understand the point of Zerk.