The top weight in a welter system has been around for at least 20 years and it one of the better approaches but it needs a lot of work to become profitable. The topweight is really just a fairly classy horse that is usually consistent, both very reliable factors in finding a winner. It's just a pity about the weight which tends to bring it back to the rest of the field (as it should). So as usual it comes down to the fitness factor.
John