Hi Butternut ,
I ran your plan through my data base & it`s not bad ,I modified some of the rules ,which made it more consistant with greater return.

Added rules
4-35 career starts,any less & the stats fell away.
Delete 20%+ Win% rule altogether.
Delete won at distance rule, because these 2 rules, caused it to miss many good paying Mules, which lowered the final profits.

Add, must have a 50%+ Plc record.(Any less & the stats fell away.)
Hcp Wt. 58.5 & less.
Must be $4-$11 pre-post market,this helped to avoid poor value Mules which ended up with a solid SR but still showed a loss in the end.
Todays distance 1000-1600M.(this distance rage worked the best)
Delete all tracks rated "Slow" this showed a low loss. (Fast,Good,Dead Heavy worked the strongest).

This was tested over the last 4 years

Thanks for sharing your method.

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Cheers.