Hi Baco.
I am assuming the $3.50 rule applies to live market price.

It is very difficult to show a profit in that narrow range using TAB prices.
Betfair would definitely put the idea into profit if one changed the rule for live prices to $2.80-5.00
This is the killing field price range a lot of professionals hone in on.

The Barrier rule may work strongest on races 1200m & less.
Have a look at races 1200m & less.


Try changing the rule about price to...
Must be $3.20-15.00 Pre-post newspaper.
I have found this to be a very strong rule for most systems & has improved a majority of systems showing an initial loss into a profit or less of a loss.

I believe you will see a lower SR but higher ROI (Return on investment).

Cheers.

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Cheers.