Have you tried the neomycin treated feed??? It's been suggested many times.
It's also been suggested that treating the entire pond with salt is not sufficient to treat fungus, and on top of that, the salt has other effects on the ecosystem that are not beneficial in higher concentrations.
If stress factors are present that are optimum for fungus growth it's quite possible the entire population is affected in some manner, so Bass present may not be interested in normal feeding patterns that would suggest they may devour infected fish.
Point-blank, I believe you have a water quality issue that has brough this situation on, and I would highly recommend you contact Lusk and get his advise before you have an irreversible situation.