In Japan, the hobbyist are more focused on showing fish when they are finished. Some of toshio's work won at the all japan show at 20 years of age.
The kohaku posted was really nice. I think in 3 years it will bulk the way you want it to. Because I've been a Matsunosuke fan for over 20 years, it's the other fish that plump in a hurry that look strange to me. The pic JR posted of the koi with the long body from nose to dorsal is the poster child for magoi bloodline. Once you can recognize the look, you can identify it. I found one at the dealer who hosted the Puget Sound Show this past weekend. It now resides with a lady named carmen in the tri-cities of Washington state. I told her figure on 10 years