
Personally I would avoid a mating with both parents higher than average. A high hip score can be down to many things - damage to the growth plates, which may be traumatic or due to infection, and many environmental factors as well as the hereditary aspect.
If you have a really outstanding dog with suspected damage, it's worth doing a test mating to a bitch with a very low score, or vice-versa. The pups would need to be kept in very responsible homes, with the breeder paying for hip screening at a suitable age. Should only be thought about by a serious and experienced breeder.
But the last thing you would want was a mating with both parents over average!!
Just my opinion
Jo and the Casblaidd Flatcoats