Hi Demo - sounds like his"My Fine Ratings' could be the problem.
I use something similar by betting the top two but the second of the top two has to be at least six points clear of the third selection in my ratings.
Of course the approach I use would also depend on how the points are allocated and over what range. But what I do tries to ensure that the selections are standouts and not close to the other ratings.
Based on MFR I could be in trouble today as I have eight races weeded out and all have the fav in my top two.