GD4TH,

Maybe Iwas following on from "Thoroughbred's" starting comments and didn't read your post correctly.
If you are using a rating system, you wouldn't add more rules unless the rules you are adding are not already there. I would define the present rules and see what could be letting your ratings down and maybe add extra rules. What could help to improve it .
* Pre-post market
* Up in weight
* Days sinced raced
* Starts from spell
* Jockey
* Barrier
You would have to rate each rule , say 1-10 and add these proportionally to you present rating.
Cyah
Ray.