For most of the last year we had American Bress exclusively. We are coming up on our 1 year anniversary with them. I think I have about 30 pullets in that tractor, plus some layers, roosters, and capons in my coop. I honestly don't know what my wife has in the brooder/grow out pens at the moment - but I think it is 4 different assorted breeds (but mostly roosters).
Sounds like you have lots of culling to do.