I also dive in the Pacific Northwest (I live in Mukilteo, just north of Seattle).
IMO, the 36 would provide WAY more than enough lift. I dive the 36, and wish I had the 27 instead, because it's more streamlined (although due to the baffles of the 36 the difference is negligible).
I dive LP95s and the E8 130's - both steel, and both BIG tanks.
Even in the event of a catastrophic suit flood, the 27 will easily get you to the surface unless you are dangerously overweighted.
Remember that you only need enough lift in your wing to float your rig on the surface of the water. Your body is positively buoyant. Anything else is excess.
If you are neutral at depth, all you have to do is kick up a foot or two and you will begin an ascent to the surface as Boyle's law and Archimedes' Principle take over - causing you to have to dump air or make an uncontrolled ascent.
At depth, whether you are diving a 27, 36, or even a 100 pound wing, you should have only very little gas in your wing.
The only time my 36# wing is even close to fully inflated is when I am on the surface.