I'm having similar issues. I finally finished the SLAM and passed the OCLT and started adding the salt. I know exactly how much salt to add to get between 3200 and 3400.
My salt generator is stating 2400 and inspect cell and add salt which it will do until the salt level is at least 2700.
I tested the water and it tests at 3400 and for the amount of salt added that should be the reading. My water temperature is 71. I don't know what could be the problem.