You could spend a bit of money on a decent form service. Depending on how much you outlay on punting a month.

If very little, buy form guides like the Sportsman,Wizard or Winning post. If you outlay a couple of hundred a week and up, pay for a form service as it will pay for itself [and more].

Just for Sat. [or any other day] you can access for 24hrs for less than $5 dollars from: http://www.pastthepost.com.au .Lots of info about any horses form or history.