G'day purple,
based on statistics, I would only add this:
(a) no bet,maidens, hurdles, ladies only races, or races for Fillies and Mares only.

(b) no bet where a conveyance is set to carry 3.5kg's (more or less) than set to carry last start. IGNORE ALL CLAIMERS.

(C) No bet where a conveyance did not did not travel within 3.5 lenghts of the winner last start (regardless of finishing poosition last start)