Cont... One thing I did which managed to show a slight profit, or at least break even was backing the pre-post fav (I used WA TAB-FORM) at Top Fluc. with a minimum price stipulation equal to the pre-post odds eg. pre=post fave = Black Tom quoted @ 3-1, ($4) bet reads $100 (eg) to win Black Tom @ Top Fluctuation, with a minimum price accepted of 3-1. ($4)

So Black Tom wins at 2-1 but had a Top Fluc of 3-1 ($4) bet is on,

eg 2 Black Tom wins at $3.75 but Top Fluc was $3.80 bet is off

eg 3 Black Tom loses, Top Fluc was $3.80 Bet is OFF

I never did the work out but I suspect that it would turn into profit if the Minimum price accepted was say 2 points in excess of the Pre-post eg.

$100 win Black Tom (PPP was 3-1) minimum price accepted = 5-1,

Bets would reduce dramatically but I suspect a profit would be made! I say this because, bets just taken overall or at random (over time) showed about 30% S/R and a LOT of around 10-12%