Yes, what kind of collar do you use on walks? Have you ever heard of or seen the gentle leader? I use it on Rita (my yellow Labrador, see below in my siggy), and it works great for her. But, your boy might be too strong for the gentle leader, but I would give it a shot, it might work for better control and corrections.
The gentle leader is like a horse halter, for dogs. When you lead the head, the body will follow, just like horses. A lot of people ask me if it is a muzzle (then they see the wagging tail and smile, lol), it is most definetley not a muzzle. The dog can open his/her mouth, pant, eat, and drink water with it on (but obviously not meant for all day wear, just during walks and training). My Labrador can play fetch while wearing her GL.

Because you own a large and strong dog (my girl is strong as well) I use a leash with two clips (I got the one I have from Guide Dogs for the Blind), so one clip is attached to her regular collar, and one clip is attached to the GL.

www.gentleleader.com

Good luck!!