I see you have read the Equss magazine article.
I show Quarter Horse WP and EP. The way that they get most horses to do a almost 4-beat lope is they hobble them or tie them down. I commenly see them bleeding horses, not feeding or watering just so the horse will be lethargic. Basically the horse who is the biggest and has the slowest lope and jog wins. But that's just what I see. Its a huge problem. I have gone to some recent shows and I have noticed that judges are being more picky. I also see draw reins used to tie down horses to force them into a slower lope. Its sickening.