Twodogs,
I was keeping a manual record of the top zipform selection, since mid-Aug last year to about mid Jan, - Saturdays and most Wednesdays.
Strike rate of the top zip over that time was around 19%, with an ave price of around $3.90.

The manual inputting was a pain, so I've moved on - can't provide further breakdowns or info of others within so many kilos of the top runner.
HTH