"I just think that it's overdone in the halter horses." Impressive is not overdone in the halter horses. Posty hocks, bad feet, HYPP, upright pasterns, too much bulk, and other traits specifically bred for are what's overdone in the halter horses. Notice Impressive didn't have upright pasterns. Or too much bulk. Or posty hocks. He did have HYPP, but that could have been eliminated in the first generation.