Something to think about ...

Maybe create yourself a blackbook as I think horses with a 40% win rate would be quite rare ( might only be a 20 or 30 meeting your criteria). That way you don't have to check each race for the form. You will just need to check if any of your horses are scheduled to be running on the day.

Good luck with it .. I will follow these selections tommorow as I am eager to see how it performs.

Good Luck