I noticed you said you had in in floor cleaning system. My understanding is that they create a lot of backpressure and therefore requre a bigger pump. When I was getting quotes on having my pool built (before I decided to go with fiberglass) I contemplated the in floor cleaning systems and the pumps that were in the quotes were on the large side compared to the filter. A cardridge filter will filter almost as small a particle as a DE filter and will actually filter better once it gets a bit dirty. You might want to inspect your cartridge for damage that might be allowing the dirt to get back into you pool. The high level of organics in your water are certainly adding to your problem. You need to get them out ASAP on a regular basis. I don't know if a robotic or presure side cleaner can be used with an in floor cleaner but if it can it might be an option.
Also, you did not specify what brand of SWG you have but most of the manufacturers recommend keeping the CYA between 60-80 ppm with a SWG.
I'm in St. Augustine also (North Beach) and my pool (6600 gal fiberglass IG with 300 gal raised spillover spa and SWG) always has a layer of pollen sitting on it now but the skimmer takes care of it, I only vacumn once every week or two and run my Cl at 3 or 4 ppm. Other than the pollen on the surface my water is crystal clear. I do try to skim daily, however.
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