I have 3 feeders and have been getting two male ruby-throated hummers daily. I also have a lot of flowers that they like. I was reading something on the absence of hummers yesterday. They may not be coming because:
1. The area has many flowers which the are more interested in
2. They are breeding
4. the feeders aren't clean ( it seems as though you are keeping them clean, though)
5. you need more color in your gardens
You could try adding plants , like honey suckle, hostas, columbine, red wave petunias, salvia, or bee balm, near your feeders.
New Additions to Life List: semipalmated plover, prairie warbler, belted kingfisher, ruddy turnstone