Heres a plan that has been tested over 4.50 years.
This was worked out on my GTX program
This program has the luxury of a morning pre-post market, which I find very handy for weeding out the potential short payers or very long payers.
E.G. 89% of all winners come from the first 7 in the Pre-post market.
That means anything greater than this, has only a 11% chance of getting up.

The reasoning behind the rule of 1-9 first starters in the field, is that we are assuming that this is a lower class sort of race , this should give our Mule a greater chance to do it`s thing ,seeing that it had won the race distance previously.
We are not asking it to do anything different to what it already hasprooved
I found the Plan fell into a hole if you applied it to races where there were no first starters in the race.

2-3yo Plan

RACE RULES:
include if Distance between 1050 and 1350 (Does not work on 1000M races)
include if Field Size between 5 and 13 (any more than this & it falls over)
include if number of First Starters in field between 1 and 9 (very important)
include if Area = Metropolitan, Provincial (no Country)

HORSE RULES:
include if Age between 2yo and 3yo

HORSE RATING RULES:
exclude if Morning Line between $0.10 and $3.00
include if Morning Line Rank between 1 and 7

HORSE STATISTICS RULES:
include if Career Starts between 2 and 20

HORSE FORM RULES RUN #1:
include if Dist Change = 0 (exactly same dist as last start)
include if FinPos between 1 and 1 (Won it`s last race)

HORSE FORM RULES RUN #2nd last run:
include if FinPos between 2 and 25 (2nd last run)

190 Bets
92% POT Win
2.5% POT Place
25% SR Win
48% PlaceSR
Longest run of outs 11 win
Longest run of ots for Place 6
3.5 Bets a month 7 days a week.

Cheers.

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Cheers.