Donnie,

Keep bringing the output down to avoid overchlorinating. If you're at 9 ppm at 25%, dropping it to 8 - 12% should get you to about 3-4 ppm.
How many hours per day is your pump running? Do you have the pump connected through the Digital?
Unfortunately this time of year and at these temps, there's not alot of demand for chlorine.
Fortunately, with the Automatic temperature compensation, as the temps increase, the output will increase automatically too.