Shaun, if this stated pre-post fav instead of 100 pointer it would equal Hot Pots system from way back.

However I think you are starting from the right place, I haven't got the data in the formatt that you want but using the same rules at Perth for the last 3 years (except I used TAB form Ratings) the result is around 20% POT win, and 9% place, but this Sat only and using Maxi Divi for the win, and half the stake at best of WA Tab/NSW Tab, and half at unitab for the place.