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The answer is hitting your chosen spot from 1 hr before tide change to one hour after the tide change. No rip current and it's when you can get your limit with a short soak.
I was at a PSA meeting where the speaker was the shellfish biologist from the WDFW. The topic of spot shrimping at Neah Bay came up. He said they are fished at the heads of canyons in 500-600 fow. Usually about 30 miles offshore. Due to the extreme depth/distance its predominantly a commercial fishery. Just thought I'd pass it along.