garyf,
Thanks for your reply and the thoughts included in it.
My own take on this particular situation is that "backfitting" would be a method of improving the history of the system maybe in order to impress somebody else. My records are for my benefit so there would be no point in trying to fool myself. I do, as a matter of course, keep details of all my selections and will continue to do so with the new improved (tweaked) version. Thanks once again.

Wesmip1,
There are 30 winners if you include multiple first starters in the one race and 29 if not. There were 1135 bets with them, 928 if you exclude them.
Expected winners is problematical because the prices range from $24.00 to $95.00. I don't keep records of whether the bets are STab or Sportingbet.
Cheers
Ron