You have some great backyard visitors. If you can't get more distance between the perch and the fence, I would consider putting some cardboard/linen or something in front of the fence for a smoother BG.
Roy
I realize that the third Bluebird did land next to the tie.....but wow.....3 Bluebirds at once. Axel has a good suggestion for the future. The birds look nice but I think that there is noise, especially in the BG that needs to be removed. You have a lot of potential in your backyard.