Can I do this? SWG and Chlorine?

[waterbear]

Please post a full set of test results and info on your pool and equipment.
How many gallons is your pool (sign says 8k) and which cell do you have? The standard 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.)
If your pool is omly 8k then you should be able to run the cell at a very low output and 8 hours run time should be more than enough to maintain proper chlorine levels. Whether you can cut your pump run time back is a different story that has nothing to do with the SWG. It is a function of your pump/filter combo.