With more updates added to data
I got...

22% SR
24% POT

Av price $5.64

RULES
Don Scott 1
LS 1
Career Starts => 11
Runners 11-14

There were 173 selections for the System
There were 38 Winners for the System for a strike rate of 21.97%
There were $214.57 returned for WIN (after 5% commission) which means a Profit or loss of $41.57 or a percentage profit/loss of 24.03%

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

If using TAB prices , one would have to work out what the average price was for that sample then compare that to the average Betfair price sample.

The Betfair price will always have the higher average price even after coms.

It is very challenging trying to find systems that show a profit using TAB divs.
Betfair prices can make a huge difference to results.

There will be many examples of horses showing say $6.00 the win on TAB & $13.00 on Betfair.

If one jags just a couple of these , it makes a huge difference to the average price for that sample.

__________________
Cheers.