I think the real key to this is to breed to a dog with not too long a muzzle or too short lower jaw but to an individual that has a good balance of everything. I believe staying in the family is the most consistent way to do it but will probably take more time to do it. I think breeding is like steering a boat you have to keep it on coarse. I think the devil is in the details and requires you to steer it a little and know which direction it is going and deciding if it needs adjusting. Breeding to the ideal individual seems to be the most probable direction for success in the long run in my opinion.