If you just divide time into distance you and make no adjustments,then dog with the avg shorter distances raced would normally appear to be the fastest, so you do need to make adjustments from track to track.

A starting point would be to gather all the win times for each track an distance in the State for a set period or for a set number of winners,then find the avg Win Time an the Standard deviation for all those times.

Now to find the Fixed Standard for each track, multiply the Standard Deviation by 1.96, then subtract this from your average time, this will become your Fixed Point for this Track but the main problem now is how to identify/quantify the effect of Better Classes of runners from track to track.

I'll post some more later this evening, once racing has finished