This thing is a big loser Glendo in it's current form. Resorting to "top" trainers does more harm than good so I dropped that idea altogether in coming up with the following:

Sat Metro Syd + Melb only
5yo+ aged horses eliminated (sorry Kenchar)
eliminate maidens (you know who you are)
can not be first up
must have placed last start
must be weighted to carry 52.5kg or less
SP 5.0 or more
Must have a Predicted Posn Rank 1-3 per Bet Selector

NSW TAB divs June 2001 - present

Races 188
Races won 31
SR/Race 16.5%
Bets($1 unit) 214
Profit 175 units
POT 81.8%

The place results show 14.3% POT for good measure.