I'll take a stab at it.

In races with 8 runners favourite must be less than $2.40 or more than $3.30. Look at runners paying $10 or more, especially if last start winners. If more than one take the one with the highest Unitab rating. Back for a win..OR ..if prices permit back both to place so you make a profit if one or both run a place ?????

That's just after looking at the Unitab website without any other form considerations thrown in.