Would you be willing to kill off the whole pond and start new?
Possibly seine the pond and set aside a few of the SMB and YP for stockers after the kill...

Till more help comes along, might check into threads that talk about clearing up water like you have. It might be that it won't settle on it's own. Seems like I have heard explanation of why this occurs, but never paid attention to the conversation. It may never settle until you treat it? Catfish can also stir the water up, and also aeration if not done properly. Take a jar of it and let it sit undisturbed for a while. Does the particles settle to the bottom on their own?

Others may be along with better help, best I can do.