Maybe you should only look at group races, listed, quality and sat metro open handicaps.

One thing I found that was amazing was the healthy trifecta dividends on favs in group races.

For example Sunline/Shogun Lodge/Defier trifecta in the Doni paid over $200 - yet they were the 3 favs. I know it was a big field, but there were only about 5 or 6 good chances. ALl you had to do was standout Sunline from the next two favs. 5 units costs $10. Yields over $1000. Not bad for a simple combo.

In group races, combos involving 1,2,3 favs works suprising well.