The Free for All Races tend to throw together dogs with all the necessary form factors to be able to frame accurate markets
Sandown Race 8 is an excellent Race to rate because it is very easy to align each dogs ability against each other.

2 Vapour Whirl $2.65
3 Schalken $10.00
4 Fenceline $9.00
5 Trewly Special $11.00
6 Sleek Physique $100
7 Azzaneed Ispeed $6.60
8 Corzac $6.10

The problem arises here because those that set the markets are analyzing the same form factors that we are looking at.
So what happens is their market and our market become pretty much the same.
And this is what has happened with Race 8 at Sandown tonight.
So let's try a Trifecta here.

2
4,7,8
3,4,5,7,8

Cost $6