Don't trust that the Betfair historical data is correct.
I downloaded a significant sample size (12 months) which showed a significant edge with filters on a daily basis, in reality I've been using Gruss Betting Assistant and set it up correctly. After a month of betting on every race with the filters it shows a loss. I took commission into consideration, so it's not that.
Where they are getting their data from certainly isn't from the actual Betfair SP. Something is really off in a big way!

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