Sell this shoe or go for decCO?

A good question to ask is whether DCO is really that useful to you, compared to a line of %(all)stat. I will not attempt to do numbers for you because I don't know what you're starting from and what else you're hoping to get (as an alternative cubed result), but sometimes I feel that DCO is heavily overrated, unlike DSE.

If you're having this on your cannoneer, I'd also need to be enlightened by what Double Down actually does...

Hadriel