I haven't got any stats on Ratings, but I do have 5 years worth of Herald Sun formguides so I'll have a butchers. I agree with your Pre-Post restrictions, this was one of Privateers best filters. I have nothing to back this up but in one of my systems, prizemoney went into profit at $29,999, continued to increase until $99,999 then petered out at $199,999. This was uncanny as it rose as if some perfect mathematical formula, then drifted down until it ran out of steam, Each increase in P'money met with an increase in POT, then each decrease in P'money after $99,999 met with a decrease in POT. It was gradual and consistent and this system had nothing to do with form, so it makes the P'money an even more reliable indicator for mine. So P'money from say $30k to $200k might be worth a look. I'd also look at the number of starts for each runner, and something like 10 to 20 starts will give you a horse that's still got improvement in it, and I'm assuming that the rest of the field will have had enough starts to be able to have whatever formula it is, applied as a Rating. Not much point having horses with very few starts next to their name. I'd only go with Metro.

Anything else, like introducing or deleting your own 'form' and you're **************ising the formula.

There you go, I've got opinions on subjects I know very little about ..... it's one of my more endearing qualities