I find price filters can make a significant difference if one can find the right balance..

I use them on a stratergy at the moment & it improve the systems SR dramatically.

The tricky bit is finding the filters most suitable to ones stratergy that actually improves the exsisting system..

Example.
Bet the 3rd Fav to win, if the...
Fav is <=2.60
&
2nd Fav is >=4.00

The 3rd fav would be big odds under this scenerio.

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Cheers.