Welcome to the forum!
In my opinion, sunfish, crappie, and possibly the perch, together in the same 3/4 acre pond is asking for trouble, especially with Walleye as the main predator... overpopulation issues big time. I'm not sold on the CC either, and I don't believe they will do anything to help your algae.
Hopefully, someone will be along shortly to suggest an appropriate course of action.....sorry for sounding so negative, but part of owning a pond is studying, learning, and setting goals that are realistic and manageable. MOST ponds are managed with a balanced scenario in mind, and getting there usually means concessions must be made.... Hang tight, I'm sure better advice is on the way....