Hi Josh- Wow you have nice plants.
I live near Seattle, same longitude as you so also long gloomy low-light winters.
But for my houseplants I have a huge east facing floor to ceiling window with a skylight overhead, so although the succulents are not real happy about winter, they mostly survive. How do you do it? Yours look fabulous.
I gave up on Escheverias and other Mealybug magnets. I do use both systemic insecticide occasionally, and sometimes spray with Azamax, as a "least toxic" alternative.