Need to test a greyhound lay system

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Hi. I think I've found a lay selection method, but can't be sure yet. The selections produce a very good yield over 262 bets/60 days, based on the Betfair price at the scheduled off with lay odds no greater than 8.0. My problem is how to be sure? I only have 60 day's worth of live prices available but imagine I would need a year's worth? Betfair's historical data doesn't show the price available at a particular time, only a range of prices. And the Fracsoft data is going to cost a fortune for a year's worth. Are there any tricks I can use, such as using average Adrian Massey odds, or are the live Betfair prices the only way to be certain before I put money on it? Does anyone have a year's worth of Betfair prices captured for BAGS races that they'd be happy to send me? Or I could pay you for it? Maybe we could pool resources and buy the Fracsoft data between us? The official price for a year's worth of BAGS races is about £450!! Thanks.

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Re: Need to test a greyhound lay system Do live Betfair prices match up with bf historical data over a period of time, i.e. the differences smooth out over a number of selections?