Well I haven't been even close so far.

Here's one that hopefully turns it around.

8 KINKA BALE $2.6
6 MERCURY VAPOUR $4.8
7 PREMIER MOMENT $7
2 PREMIER REWARD $11
3 SALVADOR BALE $14
1 JESSIE'S REEF $15
4 ARVO'S JOSIE $25

Trifecta 8 - 6,7 - 6,7,2 for $8 worth