I got...

24%SR
32% POT

We changed field size to 11-14 runners
All the rest the same.

There were 161 selections for the System
There were 38 Winners for the System for a strike rate of 23.6%
There were $214.57 returned for WIN (after 5% commission) which means a Profit or loss of $53.57 or a percentage profit/loss of 33.27%

Test Another System

The Rules used were : lastStart = 1 and donScottRank = 1 and careerRaces >= 11 and runners >= 11 and runners <=14

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Cheers.