It sounds like what you want is a braid or spectra line with a
good length of flouro leader. PowerPro (or any spectra line)
will sink fast and have zero stretch when you set the hook.
I'm always amazed at how sensitive it is. 

The problem I see is that if you're all up in some rocky areas
and get that spectra snagged you're never, ever, ever, ever
going to break it free. You can pop off the mono easy enough
(15# and less) so if you use this method you should consider a
braid->mono inline knot of some kind to allow yourself the
ability to slip out of a sticky situation without leaving 30
yards of the razor-like braid floating in the water. 

We don't have the current that you do here in La Jolla and
I've had good success with 15# PLine and a 2oz leadhead for
near-vertical jigging. When the tide rips, though, I feel your
pain.

Good luck!

-Drew