Been a couple years since I hit Quennel, but used to frequent it often. Bass was still top notch in my opinion, but the trout seemed to have slowed down over the last few years I fished there.
I heard rumors they stopped stocking it, so that may be a factor. I used to catch lots of nice 2-3 lbs rainbows by draggin gangtroll and firetiger quickfish. I never bonked any fish out of that lake. All C&R. It's a very nutrient rich lake for the island, low visibility, major algae blooms in summer and muddy tasting fish, pretty much year round.
Just my 2.5 cents.