The deer only eat the sunflowers as they first germinate. Sounds like you have a good start for some AWP to be over seeded over the plot. I would also over seed the plot with some clover. That will help a lot! Once the sunflowers are mature you will have every black bird, crackle, blue jay, canadian jay, and morning dove in the tri-county area on your plot. I planted sunflowers once and all it did was provide a magnet for song birds and all they did was scare the deer. Remember birds follow migration routes. I literally had 1000 blackbirds in my food plot at one time. It sounded like a freight train when they were in the field, they always scared the deer!!