Raw matchers simply use the slowed lines to judge if the horse is in "form" then spin off them and evaluate using the complete past performances.
Alternative is to leave the track alone for the winter till it returns to "normal" in March/April and focus on night tracks such as Delta, Retama etc
Reminds me of a Stones song
http://www.youtube.com/watch?v=_vdwbBHmtMc