Please post a full set of test results and info on your pool and equipment.
How many gallons is your pool and which cell do you have? The standaard T15 is sized for pools up to 40k gallons. However you might have a smaller cell.
I am particularly interested in your CYA level. If it is not 80 ppm then that is a major part of your problem (and also the pH control problem I know you will be having with too low a CYA.)
It is possible that your cell is wearing out and near the end of its useful life and needs to be replaced if it is no longer producing enough chlorine. A call to Goldline customer support might be in order to check that out.