When I switched from sunflower to safflower seeds the starlings and grackles emptied the feeder...on the ground. I think they were looking for the good stuff.Have you tried safflower seeds? I had European Starlings at my suet feeder chasing off all the other birds. I switched over to safflower seed and they vanished shortly thereafter, but most of the rest of the birds were perfectly happy with it.
I don't see them anymore.
The cardinals, finches, and titmice love safflower seeds.