I refrained from actually suggesting filters as we all have our pet ones, but just to give a scenario:

take Shauns' idea, Radio top pick + Tipsters top pick on tracks dead or better.
where they both agree.

Ok, now delete Jumps, Amatuer, Apprentices races, ladies only races, races for Fillies And Mares only, horses ridden by a 3kg claimer,races of 2000+, races with 15+ runners , and horses having its first run, its still a bet

IF it is fav 1 min b4 the jump, or if you need to place bets b4 racing its a bet IF it is Pre-Post fav (always using the same source)

This has shown a break even (win) and a slight profit for the place,

but also the idea has shown only a 1% loss with no filters at all. over 1100 bets + (for the place that is)