In an 8500 gallon pool, 2.25 cups of 6% bleach will raise your FC by 1 ppm, and certainly is a good way to raise chlorine in your pool--but if you don't have an excessive chlorine demand that needs to be met by shocking, why don't you just let the SWCG take care of it?

I'm curious--what testing method are you using to get your chlorine levels?