I have no idea, but am very interested in the opinion of the company that did your survey. Since you have a constant influx of tannic acid I would imagine on a lake that size you would need more frequent and much larger applications.

I have seen small ponds here that are totally surrounded by pines, and through constant deposit of pine needles the ph is acidic and the pond is essentially devoid of fish

Let's wait for the experts

I also think most of the experts
Would disagree with stocking your forage base at the same time as your predators, but were getting ahead of ourselves.