I think you should change your rules to void all in running bets where a horse is disqualified for having the wrong weight. If you consider yesterday's race, the favourite carried 14 pounds less than its allotted weight. It was virtually a certainty. Unscrupulous connections could lay the first past the post and back the second past the post in running. This is a huge moral hazard. This doesn't occur often so changing the in running rules wouldn't inconvenience customers very much, but would stop a potentially extremely high impact abuse.