Ran Lucky 7 approach through Online System Builder

RULES
No.7 only
1-9 runners.
All prices

RESULT
7% SR
-42% LOT

Even targeting races with 7 runners & less had a terrible
SR of 8% & -45% LOT which tells you that throwing a dart in such field would produce 14%SR

On the positive side , it makes for a brilliant Lay plan.
Betting 1/15th of Bank
Betting Fixed Liability.

LAY plan rules
Targeting No.7 in races with 1-9 runners , keeps the Lay price nice & low.
Lay bet the lot on Betfair at .5% of bank, for a profit of approx 20%+ POT

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Cheers.