I have seen FA during the winter in Oklahoma ponds. Usually a much different set of circumstances.
If you are constantly battling FA, I would get the Phosphorus level checked in your water. That is most likely the catalyst for FA growth.
I have no doubt of phosphorus and nitrates. We (unfortunately) have over 60 acres of run off from row crop Ag fields flowing into our pond. I do have two small silt catch ponds, but both are heavily silted in from many years of run off. It would be ideal to have both cleaned out and even deepened. However, my pond budget isn't large enough for this job. As many PB members are aware, moving dirt is pricey. And then having a place to dump the silt, to dry and turn and dry is also a challenge.
So you are completely correct. I hate to admit it, but I find myself doing 'California Forest management' on my pond. Even though I know the best and proper way to address the issue, I instead just treat the end results of my poor management choices. But I suppose we all do the best we can with the options in front of us, eh?