Well, today there weren't any selections at the non metro tracks.

Of those that won at non metro tracks last start, there were 4 of them today for just 1 placing.

Chrome Prince will probably be able to help you with overall figures, but I'd suggest that sticking to metro tracks is best. He had a system going using similar rules and I think he stuck to metro tracks. I can actually remember a few good winners which had won at country/provincial tracks the previous Saturday, but somehow I don't think there were enough to pay for the losers.