I agree that the system is flawed and that is what got me thinking about ways to exploit the flaws. Another point is that the range of weights available can't be sufficient to accurately cover the range in horses abilities i.e. there's a bunch of horses on the limit but some are okay and others would be better off on the dole. At the other end I would argue that some horses should be carrying 65kg or more but you just never see it.

The approach I'm considering is targeting horses which are in the middle to low weights that rate the best considering only the factors the handicapper DOESN'T use.