Mark, it is possible to place your bets with IAS with a minimum price stipulation. i.e. $100 SR1-1, Min SP 3/1 /or top fluc. ( or no bet) not that that solves the problem entirely.

Crash, I realise where you were going with this one but as it happens I did a lot of research along these lines and built my own data base over a few years with the main exception that I used PRE-POST prices 3/1 or above. Overall of course, the trend was about 10% LOT, I was able to lift this ( with actual results) to a small profit of 2-3% with obvious filters, but was never game to actually try it with real money.
But this was b4 the days of being able to bet at Best tote or Top Fluc. So I feel that with a lot of concentration it could be made to "work".
Or indeed it could be used to only back the overs, using the pp as a rating sort of.
I've still got the data base on a floppy somewhere.