Just ran it through my West Aus selection system and found I do better on 1400m and over races at the major tracks but seem to do better on the shorter races at country tracks. Just to confuse me even more I get more percentage winners overall (only half a percent extra) but less money back (couple of percent ROI) on shorter races and half a percent less winners but a couple of percent more cash on longer races.
Stupid horseracing, there must be simpler hobbies.