Hi Axledog,
Been posting your original system BUT with my added rules on the Propun Tipping comp the last 2 weeks.
They being
Leader or Races Handy (on pace)
Won or ran within 2 L of winner at the 1000 - 1600
Won or within 3 L of winner at the 1650 - 3200

May add Class = Same or Drop later.
With the class drop though not up more than 3 Kg from last start (taking that from the limit weight) and

Weight today 55 KG +

With the track Conditions changing from one race to the other the past few weeks has not been an easy task to snare the winner as the selections need to be posted before the 1st race starts.
At least betting race to race one can eliminate the risks a bit .

One other thing if your betting NZ on Saturday I,ve got Hinemoa Harry from Rotorua tipping next Saturday.

Ah Choo tipped last week for a $11 winner (Unitab)

Cheers
darky