Given that you have such a great attitude to making further improvements: not as important as the suggestions in my original post, but certainly valuable if doable...

-If you changed Track Condition and R&S Pace Position to numerical data (fast=1... heavy=5) / (leader=1... backmarker=6), you could use "greater than"/"less than"/"between" operations as per the other variables. A legend could be included in parentheses for clarification.

-Weight-over-limit (or a limit weight variable) would be more useful than the absolute weight variable in isolation.

-Price rank as well as actual odds is useful. For instance, it would be great to be able to check closing price favourites only.

-SP last start is also useful.