Sounds good Mad G,

Have you a database that you can test it on?
Run a test and see what figures it spits out at you. If the figures are to your satisfaction I'd suggest you follow it on paper for a while or perhaps place very small wagers on it. Just off the top of my head you may well be dealing with shorter priced Nags, not a certainty however do not forget to check the class of previous wins to be sure if price seems extraordinarily long. Systems are not the complete answer and some fall over or at the very least go through rough patches and may need some fine tuning. Don't despair and stick with it.

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I like Bing Lee.