I looked at the idea some time back & the best divs seem to be from Melb , maybe their fields are larger.
It had some great days & a number of not so good days , mainly due to low divs. trying to make up the losses.

To try & maximise the divs ,it might be an idea to only bet when both legs of the double have say 10-12+ runners

If you can pick them in 3 , you should do very well.
Make sure one has a bank of at least 50/1 ratio , because bad runs can & will happen supprisingly.

It might be an idea to target just one venue for each day that you feel has the best value.
Dont fall for the betting every venue , you will become unstuck.

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Cheers.