That was very well written and enlightening. Thanks for the detailed explanation. I especially like how you related it to fertilizing a yard so that the good grass would prevent the weeds. How about this plan?

Apply Aquathol granuals around beach only to prevent weeds in that surrounding area
Install 4-5 aerator pads to cover entire water column
Continue use of Aquashade

Will it be counterproductive to apply aquashade a little more heavily rather than using the Cutrine? Meaning, will that block too much sun and prevent the growth of underwater weeds?

If I could eliminate treating the pond with Cutrine every 4-6 weeks during the growing season, I would be ecstatic too.