Rogue weapon swap for BS?

[Garnaak]

What I have read tends to be all over the place.

60/40 Auto/BS damage
*Auto-attack timer reset when primary swap
Just keep highest damage mainhand
on and on...

I could probably come to whatever conclusion I want by reading all the threads.

I would like to keep low delay permanently in primary and just swap to high damage for BS click. The * item is the only thing making me think otherwise. Truth or rumor? I guess even if true, I could turn auto off, swap, BS, swap, auto on. But could mess with damage output if I don't get these moves done smooth. Or maybe even server tick messes with it?

I guess the reason for this question concerns my next possible purchase?

Sebilite Croaking Dirk (Main)
or
Winters Fury (Off-hand)