Hello Sportz
I'm new to this forum game, so please bear with me.
I ran your rules as best I could with your 2nd system from July 2004 to now.the rules as I put them in the data base follows:

RACE RULES:
exclude if Class = Hurdle, Maiden, Steeple
exclude if Age Rest = 2YO
exclude if Field Size between 1 and 7

HORSE RULES:
include if TAB number = 1
exclude if Spell Count between 1 and 3

FORM RULES:
include if Days Ago last run between 1 and 21
include if FinPos last run between 1 and 4
include if FinPos 2 runs ago between 1 and 4
include if FinPos 3 runs ago between 1 and 4
include if FinPos 4 runs ago between 1 and 4

RATING RULES:
include if Morning Line Rank = 1

STATS RULES:
exclude if Distance Wins = 0

The win POT (based on Unitab divs.) = 8.7%
Longest losing win sequence = 10
Win strike rate = 34.0%

Hope this helps.