I suspect you have located them, they are just very picky about what their taking right now.  My recent camera work on Washington has shown several things.  The fish are very spooked by quick up and down movements of anything (so, don't pop a drop shot rig up and down too fast for instance).
Kicking up silt attracts SM and scares perch away.  Whenever I set the camera down on the bottem it kicked up silt and SM would move rapidly over to the camera and inspect it carefully.  If I then picked it up very slowely they would stay and watch it, move it fast and they vanished.  The schooling bass I observed were very spooky and did not seem interested in feeding.  The lone fish were more curious and did appear to be foraging.  Also, the schooling bass were typically the same size, small.  The schools were invariable located over rock or some structure. The feeding bass (loners) could be found anywhere in the same depth range. I found several schools of perch but did not see any bass near them.  However since the camera tends to make the perch flee it was tough to look all around the school.