About UNDERSTANDING Columns... I had a call with Dave yesterday to go over this. Rather than trying to decide on the factors myself-- I decided to test letting the 26,000 AI-based columns made up of 30 factors chosen by the AI engine specifically for this TYPE OF RACE (based upon how the AI sees "race type.") do the work for me. 150 factors (also known as COLUMNS) in one object.
Dirt/Tapeta races from Saturday and Monday. No Turf, no races with FTS's, no races with two d1's, two L1's or a d1/L1, or races where a H9 is the top selection.
32 races = $64.00. Return = $139.94. ROI = 118.65%. There was actually a d1 $25.00 winner that I left out since I haven't seen that high of a payoff on a d1.
You may want to look at the 26,000 columns and see how they work with your columns and also integrate with the 88% - Finding the Race Within the Race.