Hi Shaun!
I may have something here that could help you re. past results. It is based on Supertab prices which are nearly the same as the WA TAB prices. It shows the 15 minute, ten minute, five minute and final dividents. (of course the race numbe, date, horse, Jock is included)
If it's any good to you let me know. Have at least a couple of years, probably more data.
Cheers.