Sparky i'm currently following my own ratings and they are producing figures that im very happy with,the strike rate of the highest rater isnt as high i would like but like you the top 3 or 4 is producing the goods,my suggestion to you would be to restrict yourself to races where the chances of a good divedend are higher.

Try 10 starters or more on a saturday and either 11 or 12 any other day,it works for me.