In your example "On some coastal streams spawning begins in February,peaks in early April and ends in late May." So yes I would think if the delaying of the opener on Puget Sound systems helps fish then delaying the opener on the Hoh could only help fish. I didn't realize that some of the Skagit's spawn into July. So maybe that opener should be delayed into July. But personally I'd rather see everything open June 1, or June 15 or whatever date that both spreads the pressure and ensures healthy runs.
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"You learn more from losing than you do from winning." Lou Pinella