With those trees on the property line, you're gonna take some serious dustings in the spring and fall. The history of your thread kinda lines right up perfectly.
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You performed an OCLT at the first inkling of trouble. Hats off there. No need to come ask if you should. Just do and then tell us the results.
When you pass the OCLT, then it's a filtering issue. You need more filter time, or more days if already running 24/7. My 1st pool was heavily treed and even 24/7 didn't keep up for a few weeks each spring because I opened early to beat the inevitable swamp if I waited out the pollen.
You also did good elevating the FC for good measure. Start it everyday a little over high target, no need for SLAM with the FC holding.
It's your thread and it's relevant. You're 2 fer 2.