If I did my Poolmath calculator correctly based on your pool size and CYA, that would appear to be 4.5 ppm each day which does seem a bit high. Somewhat explainable perhaps based on total exposure to sun, swimming load, CYA of 40, etc. You could always sneak that CYA up to 50 to try and save some FC per day. You could also post a full set of test results and/or do an OCLT just to be safe. Hope this helps.