To be honest, the TAB prices are really irrelevant wherever you are looking at them. You need to be watching the fixed odds. It is the best indication to what the prices are doing...
If you are watching the tote, remember that the price showing when the race starts is not what it will pay. There is always another update to be done. If you are watching it on a website remember that the data has to be transferred through the server onto the site, then transferred through your modem, meaning very delayed prices. And if using a datascraping program such as 2nix, it is delayed even further.

The real money is at the track, and the tote will always follow this. Afterall, the bookies have to bet somewhere.....