Further investigation has proved fruitless. After 200 bets it looked good and was showing about 20% POT (8%LS) but now after 500 we have fallen in a big hole which I think will be very difficult to extricate ourselves from. There was a very good patch early in the piece but it has been quite dismal since and regressed somewhat to what I expected would happen in the first place.

Conclusion: You won't lose heaps doing this but you won't win either.

Have decided to stop wasting my time fiddling with the past and concentrate on the future.