Seen that so many times mate. Lads have dogs they deem to be good dogs and they work a particular way which suits them and for some reason they mate them to dogs, which might be good, but work in a totally different manner. You lose consistency this way and you end up with what you describe above. If you've got a good bayer for arguments sake, and she's doing the business for you week in week out, why breed to to an iron hard mute type? Surely if the bayer is working for you and getting you results, you'd want to breed to another type like her? Just a thought.....