New readings - Strips show 5220, drop test shows 5400, CompuPool CPSC says 3800. At least now my drops and strips are almost the same.
So, I called CompuPool and my power supply/computer matches the cell, but I also found out the power supply/computer can be calibrated. Looks like mine's off, but I already have too much salt in the pool so they are reluctant to walk me through recalibrating because it will turn off at anything past 6000 ppm. Now I'm trying to decide if I really want to drain a bunch of water, having a 44,000 gallon pool means I'd have to drain 14,500 gallons to get it back to 3500 ppm. I read here and talked to others and they stated they occasionally have to add salt due to splash-out. Thinking I'll just wait for the salt level to go down on its own.