Out of the races posted the only qualifiers for a bet were:

Tatura Race 2 -12 2nd $1.30 (A)
Tatura Race 4 - 2 2nd $1.60 (A)
Tatura Race 5 - 6 WIN $3.50/$1.80 (A)
Tatura Race 6 - 4 WIN $3.20/$1.20
Tatura Race 9 - 5 2nd $3.10
Scone Race 1 - 5 LOST (A)
Scone Race 6 - 4 WIN $3.70/$1.60

The ones above with (A) had Apprentice Jockeys. I don't have this in my database as a seperate column at the moment and I am thinking it will a better return if we exclude them.

Just today with (A) produced a return of $10.40 from 7 bets. Without (A) produced a return of $6.90 for 3 bets. That is a huge difference in POT.

Still not a bad at all either way ...

Good Luck.