I think my atk speed is around 1.7, it's odd to start stacking it because most classes want CC and CHD first.
with a Carnevil though splinters is needed instead and not sure what the proc rate is on that.
Additionally if you go the poison route, use FA headhunters as it takes your Poison % into account, same goes for Tiki Torchers if you stack fire. It makes them all that damage type instead of just the additional ones that pop out.
(This is from what I have read at least)