Hi Darkydog,
The ranking position appears to be in line to its final price ,in other words the higher its position ,the less higher priced divs obtained ,therefore missing some of the bigger divs.

If you only targeted say the Top position only .
The SR is there but the value is seldom there.

Theres nothing intrinsicly wrong with place ranking ,majority of winners come from the top 6 rankings.

All I am saying is that if you introduce a rule of 20%+ Win SR,you will miss many bigger paying divs,its like shifting sands with win percentages,it works fine some months & terrible in other months,its the better divs we need to make the average system show a profit & these generally come from high placed horses who have shown promise but just missed out on a number of occasions from winning,therefor their win % is low but place % high, which could be read as a consistant horse who is generally got its Hoof on the till ,its only a matter of some luck in the running for it to show its snout on the winning line.

I have found this simple rule of 50%+Plce & ignore Win% has made a number of systems which were showing a loss ,now showing much stronger figures than its original format.

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Cheers.