congrats on the start of something big(hopefully).
I can't improve your system, but I'd like to offer a staking plan I've used with success over the years.

Each bet is 5% of your bank

Each bet is in the win/place bet ratio 1:5

there fore, if your horse places, and pays $1.25 or more, you are a winner.

If it places- paying only $1.20- you break even on the bet.

This staking plan is useful with systems enjoying a good collect(1st,2nd or 3rd) strike rate.

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why gobble with the turkeys, when you may soar with the eagles!!