The short answer is every Western WA unit can produce, and does produce. Some have more public land than others and since you have OnX, you can ID that ground. There is really no way to escape people here. It's just part of the landscape. You're hunting in the most densely populated area of the state, so it goes without saying you will have competition. The only way to get away from them is to go deeper, darker, further. However, that isn't necessarily necessary to kill animals. I would suggest finding gated roads with 2-8 year old clear cuts that are a mile or 2 back and live in those, and the timber immediately surrounding them. Being as you've already found sign in areas, I would definitely be going back to those areas.
If you want to delve more into harvest stats and best GMU's, etc... here is the link the harvest stats for Washington State. Break it down by GMU's, and have a map handy to compare.
https://wdfw.wa.gov/hunting/management/game-harvest
