Working on something the last couple of weeks and have recorded these results>

DS-FR (all)
525 selections
115 wins

O 525
R 453.64 (NSW Tab win)
P -71.36 or -13.59%

With race filters applied>
306 selections
67 wins

O 306
R 295.44 (NSW Tab)
P - 10.66 or -3.48%


From what i can tell the strike rate is down about 2% on what is expected during this period.

Eliminating the races I have identified as poorly performing and taking the other bets to Betfair has turned a 13.59% loss into a 4.87% profit.