I am going to add that it very well could be pollen. It's terrible in ATL right now, and would guess isn't great in FL right now, either. I would suggest running the filter pump for a full 24 hours and see what it looks like...that is if your OCLT passes.
At FC of 30, I would turn off the SWG for a day. Then turn it down. High FC gets burned off more quickly. Test often to make sure you dont drop too low.
I would also buy a round style brush and brush inside the skimmers, especially the skimmer throat, and inside the light. I also use that brush to get into the corners better. Anywhere there is a not flat surface get it brushed well.
Thats what I would shoot for, since 6ppm was giving you problems. If it makes you feel better, my target is 4-5 on the chart but I'm usually at 7-9 when I test. No chlorine smell, stinging eyes, etc when we use the pool.
In the Lake Mary / Sanford area. The pollen is bad enough that my water looks hazy from time to time right now, especially following a rain. Not sure if this is the same thing you are seeing with "white flakes" but after a rain I'll see some white, foamy stuff that disappears once the pump has been on for a while. I've been running the pump longer when it gets hazy and it eventually clears up. I really think that is what you have going on as well. I'm not seeing unusual FC usage or anything like that.