Doc, it sounds like you are well on your way to controlling your CC population. It also sounds like the CC population is simply so large that the spawn simply overwhelms the predators with the sheer numbers being produced.

Have you considered getting Greg Grimes or someone else near you to do a shock survey and remove all the stunned CC?

Having removed nearly 700 in a year must have put a dent in the breeding stock if the majority of those removed are mature fish. Consider having a few weekends of friends/family/church youth groups/Boy Scouts targeting CC and remove all that are caught. A couple Boy Scout troops or youth groups might love the opportunity to camp out for a weekend and do some night fishing!

What are the sizes and numbers of other species like BG and LMB you are catching?