I adopted the last race thing as looking back over past results i very rarely get a winner in the last anywhere..also it seems the earlier races are more profitable than the last few..I also saw this mentioned in another post recently and it got me thinking..I am not sure why this is the case,it even may be my selection method..
also another filter i use is betting only in races class 3 and above..but i might relax this and see if more bets is better.
Funnily enough i am on a run of outs at the moment..will see how it affects pot over time