Hi Try,
I look for races with particular gaps in runner prices. For example a race with small gaps between say the top 3 or 4 runners and larger price gaps for the rest of the field. I know then that if I strike the winner or the first 2 there is a good chance the 3rd place (or 2nd and 3rd place ) will be taken by runners with higher odds, consequently a better trifecta payout. This is not a hard and fast rule but I use it as a guide. Also keep an eye on the number of combinations I am covering. Too many will result in a smaller profit. Same as dutching.

I usually concentrate on Saturday races because of higher pools. I sometimes use Wednesday when able but don’t seem to have the same success.
Most of the bets are done on RaceTab but will switch to Unitab when they have races with jackpots, or visa versa.