Working with stallions, I have found that I have more control with a chain over their nose than a bit in their mouth, personally. I would be happy to race horses in bitless bridles if it suited the horse. From personal experience I have also found that the harder a horse pulls, the more likely it is to either develop into a bleeder or bleed worse.... I have used Kyneton bit's in conjunctions with snaffles for bad pullers. Works for some horses, not for others. Normally good for horses that won't tolerate a chain in their mouth. I'm guessing these horses would probably also go good in a bitless bridle, considering the Kyneton works off pressure on the nose...