I was there today, no perch for me. It is still pea soup. My temp gauge wasn’t working, but would guess the highs near 80 are likely keeping the temp in the mid 60s. I think we need more in the 50s. 14 day forecast should have things in better shape.
I think you are right about the spring, but the lake got hammered during the Covid restrictions. Outdoors and able to stay away from crowds. There were literally boat loads of people fishing ever time I was out, especially last year and into this spring. Today seemed like a typical fall Friday for boats, except it felt much more like early September than October weather wise.