Hi Max - welcome!
I'm in North Bend - just a dozen miles up the road from you. Sounds like you're most concerned about the weight of your setup, is that right?
What are your totals? Guys and gals around here will dissect your kit and offer a bunch of ways to lighten it up. For me, my setup is very comparable to a light solo tent setup, so I don't feel like there's a weight penalty at all to hammocking out here. I've never run into problems with trees being too big for my webbing. Even in the Hoh we had no problems finding appropriate trees. The only place me and my hammock-packing buddy have ever had a problem is in Central Washington. No trees at all
He did manage a nap by rigging up a scary setup between two boulders, however.
If you post up what you're using, we can take a look at it. I agree with your comments on Pac NW backpacking, but we have our advantages, too. I almost never carry water for example. That's probably the single heaviest item in a lot of backpackers' packs and we can essentially eliminate it in many parts of the Cascades. Sweet!