I need to correct my last post as I have discovered a non qualifying horse on the 7th April had "snuck" through!

One unit on all selections

Bank +93.45 units
POT % = 34.0%

Betting extra unit on qualifiers starting 7,14 or 21 days ago

Bank +166.20 units
POT % = 36.7%

I have also looked at how the Zipform ratings would affect these results and have noticed that if you had only supported horses that had a Zipform rating of >=58 (with all the other rules in place) then there would have been, since 18th February (as I only have the Zipform ratings for all meetings since then),

Bets 26
Wins 14
Win S/R 56.8%
Bank +62.9 units
POT % = 125.8%

Maybe this would suggest we place an extra win unit on each of these selections as well. Of the 26 selections only 2 had not raced on either 7,14 or 21 days ago - both won! The lowest dividend of these 14 winners was $2.20 and the biggest was $8.00.

We would now have 3 units on each of these horses (that raced 7,14 or 21 days ago) and 2 units on the other horses.

Our results (bringing in this new rule since 18th February) would give

Bets 275
Wins 69
Win S/R 25.1%
Bank +199.2 units
POT% = 41.6%

I think this is becoming a "tidy" system and well worth persuing. What do you think?