I have mine at 7 degrees. Steering like crap could be because you've got steering cross your link in front of the axle screwing up the ackerman angle. Or you've got bump steer due to your draglink from your steering box not parrallel to your hair pins or bones.
I also see you have rear hairpins used on the front. I've heard they don't work well on the front and cause bump steer too.