Another option
We've used Petit Trinidad SR, as the previous owner had, until 2009 when we got a deal on a Seahawk paint that has worked well. We recoated with it in January. We moor in the mouth of the Duwamish, but it's still plenty salty, judging by the mussels on everything hanging down and occasional barnacle on the prop and strut. No complaints. We usually go two years between haulouts.
We finally got out again this month and after three straight weekend cruises, the bottom is free of the soft stuff and motoring and sailing speed is normal.