Another question about Frenzy barb's weapon setup

I've got an eth colossus sword(for the right hand), making Death there should be a no brainer.

But my question is about Grief(which i'm planning to use as my main weapon).

I found a 5socketed colossus sword today and am now thinking wheter it's worth going for Grief there. As i've understood(according to arreat summit) the base weapon speed for a Barb using a CS is 15(pls correct em if i'm wrong).

I would take CS over CB any day, but the PB is seriously faster than CS, so how should i solve my dilemma here?|||CS/CS will be slooow. Make Grief in a PB.

For optimal speed you should equip Grief as primary weapon in the right inventory slow by picking up and putting down Death (above gloves) after both weapons are equipped.|||Thx Hubb and y i mixed up the left/right hand.