Charlie:
From this data and the results from the SEGMENTS screen for the turf horses you can see why FTL stays away from the turf races. The propensity of dirt horses to be top 2 or 3 at the 2nd call does not reappear on turf. Many are 4th or 5th at 2C and probably have superior 3rd fractions in order to win.
It appears that the sweet spot is when you have between 3 and 5 contenders and where the winner is top 3 2nd call, of course with only 3 contenders they are all top 3
