Sounds like you are enjoying a very productive pond where the fishing is fun and catch rates are high.

With regard to your question about CC, yes, I think your thoughts are in principle, theoretically sound. If the CC were getting their nutrition from feed, they would be eating fewer BG and this would allow LMB and WCP to add some weight to themselves as well. There will be a fertilizer effect as well that will benefit YOY of all species.

If your pond is nutrient poor, I would very much encourage feeding. Even so, in my way of thinking, the older a pond is and the larger it is, the less feeding makes sense. For example, at the same carry/acre, a 5 acre pond has 5 times the fish as a 1 acre pond. So 5 times the management effort as the 1 acre.

It depends on your goals but after reading your harvest management plan there are still areas you could explore there to improve the forage situation. You didn't mention harvesting any CC for example. Harvesting 10 and adding 13 12" CC would be a good plan to reduce the CC impact on forage situation. You don't harvest any LMB. Just the right amount of harvest of LMB will have a profound impact on growth LMB. Even BG respond to the correct amount of harvesting. They respond by growing faster and having improved condition and having more reproductive success. Only saying, unless you really want more fish, there are option that could produce similar results for the individual fish you catch going forward that are in balance with the current trophic level of your pond.

Not downing feed at all, but the milage varies and not all outcomes are better, it really depends on your goals. If you do feed, it will expand the carry and that carry will be 80% filled by the end of the first growing season. By the end of second, it will have filled and you will have more fish and some of the fish will have grown in response to feeding. BUT, you will have more fish that will have to be managed with more effort as they grow. In other words, the effect on the growth of fish is mostly in during the first year and a very modest effect in the second year. After that, there is no effect on growth. All you have done is expanded the carry and increased the number of fish you have. Only population management or increased feeding can improve growth going forward. Feeding is great if you want more carry, but if after careful consideration what you really want are larger fish, then go the route of adjusting populations as you will be eventually forced to return to that approach in the future.

It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers