Hi! Welcome. Looks like you are already in good shape. You can certainly run your pool with a CYA between 80 and 90ppm. Just keep your FC (Free Chlorine) between 5ppm and 10ppm and when/if you need to shock it, raise it to 20ppm. If you decide to put in an SWCG, you'll want it to keep FC at 5% or more of your CYA level (CYA=80 ===> FC >= 4).