Thanks for your opinions so far.

foxwood makes it sound very simple however, as I explained, I would not know which selections to make until before the race which is something I can't do as I work for a living . Having said that, I was home today and could of used system C, but normally I can't.

I tried system B today with a small loss but not as much of a loss if I would of used my normal system (D below) or with system C.