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Lower compression can result in higher oil bypass which explains that plug being dirty.
Your dealing with a 10 year old vehicle with 200K on the clock..it’s not going to run like new.
You can try high mileage oil, Perhaps try some Marvel Mystery oil and see if you may have a clogged oil rig and maybe it can clean it up a bit.
But in the end it is what it is, you can baby it along and get as much out of it as possible.