I have found laying the price range 3.50-5.90 works well on those Radio TAB and guest tipster selections where they have an asterisk at top of their fist selection number.

That asterisk represents their specials for the day.

I notice their specials sometimes get up if <=3.40
But fall over horrible if 3.50-5.90

Maybe this price 35.0-5.90 range could work for your selection process.

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Cheers.