i'm certainly new to this myself, but i am doing my testing in the late afternoon. i feel like since the sun has been out all day, my chlorine usage should be greatest then.
i have been slowly cutting back on percentage and still making lots of chlorine. i have it down to 40 percent now. my chlorine level was still at 7.5 yesterday afternoon. so, i cut back my pump run time to exactly 8 hours. i don't want to go lower than that since that it the 'magic' number recommended. if i still have too much chlorine, i will cut my percentage down on the SWG again.