R&S do this analysis for you. They have a Adj Time in the formguide to take into account track differences.

Not sure how useful it is but its there.

anyone who does time analysis (i don't) knows to take thins into account but many people don't use time analysis for many reasons. Time analysis really works well when the competitors go really quickly from the outset. IOf you have a slow pace then the times may not be a true reflection of a horses abilties.