I had same concern. I was running AutoPilot on level 2 at about 20-25% with CYA of 40. I am starting to raise my CYA SLOWLY(you can always add, but have to drain pool to decrease) by filling a kneehigh with stabilizer and letting it dissolve in the skimmer. I have it up to 50 now and can run my AutoPilot on level 1 at 30 percent and have a FC of 4 and CC of 0 immediately AFTER big pool parties and the purifier is usually off when I look at the panel so I am happy where it is right now(though I do have some CYA still dissolving as I write this).
I run my filter for a few hours after the pool is put to bed for the night so the SWG can do it's thing with no added bather load or sun to interfere.