Nice to be here. I second your thoughts on Seymour Narrows, Discovery Passage and Johnstone Strait, if you're looking to get north in good time that's my route. We usually go up in August and you can get through Seymour in the evening, we hook up in a nook in the NW corner of Deepwater Bay (last couple of years there has been fishfarm floats stored there you can tie up to) then get an early start and ride the ebb as far as you can. As was said before, watch Race Passage, if its too nasty you can bail out up Chancellor Channel then Wellbore Channel.
The Broughtons are one of my favourite places, once you get north of Johnstone the amount of marinelife jumps up dramatically. Can't wait for next year!