Rod Jenkins showed up for MBB III with a bandaid on his nose, so if it's any comfort, even the great shots seem to have that problem.
I've heard, and it makes sense to me, that switching from a metal nock to a tied on nock can help. But I still shoot with a metal nock and don't hit my nose much anymore.
When I first switched over to Rick Welch's style of shooting, I whacked my nose from time to time, but lately I seem to have gotten away from it. I wish I could tell you my secret, but I don't know why. Also, I really tuck my draw hand in close to my jawbone to avoid shooting left, so the string is pretty close to my face, but I still seem to avoid hitting my face/nose with the string.
I think you have to experiment with how you get your dominant eye over the arrow. I think I tilt my head to do that now, which keeps my nose more forward and out of the path of the string, rather than rotating my head so my nose is in the path of the string. But I'm not sure of that.
I've seen Rick Welch shoot, and his nose ends up almost touching the shaft behind the cock feather, and he never hits his nose with the string, so it can be done.