The SR ends up being the same, no matter what pre-pot market you use, over 100 races.

So just use any one of them.

The online racingandsports is just as good as the newspapers & they take out the scratchings for you.

If you wish to re-frame the market percentage, then use the market re-framer as seen on Ozracingtools

An interesting observation is that if one where to back the first 5 in the pre-post, same amount on each , level stakes.

It only looses -5% LOT.

Which is less than backing the Fav outright, which looses approx -10% at level stakes.

So all you have to do is successfully delete one runner out of the five horses & you would then be in profit over 100 races.

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Cheers.