+ You need to switch to bleach. Period.
+ You need to maintain OTO DARK yellow (ie FC > 10 ppm)
+ You need to re-test your CYA using a 1:1 dilution with distilled water.
+ And, no, your ColorQ will not be sufficient, because it cannot measure chlorine levels above 10, which is something you have to do IF you want to run the pool well AND plan to have CYA levels above 40 ppm.
+ Your CYA levels *will* decline once the pool gets winter-slimed. It will NOT decline if you maintain a clear water chlorinated pool all winter. CYA is rapidly bio-degraded by a variety of bacteria that apparently typically make up a component of winter pool slime. The problem is, the end point of this process can be one of three things: nitrogen gas, nitrates (algae fertilizer), or ammonia. If it's ammonia, you will have a nightmare start-up next spring, unless you drain and refill.