If I go back to a completely different set of data that I did last year, taking all "firmers" on all racedays, not just Saturdays...
921 Bets
167 Winners
Top Fluc Profit 148.55 units or 16.13% POT
SP -117.1 or -12.71% LOT
Best Tote Profit 98.80 units or 10.73% POT
At that stage BFSP was not in Aus, but it would have beaten Top Fluc.
However, including all race days the Top Fluc loss was more than 10% on those firmers less than $3.00.
Stick to the better quality races and horses, where they are firmers and you're home and hosed.
OR
Lay the hotpots if they are within 5% of Bookie SP
Many occasions they were actually under bookie SP, but that's a whole other angle.
(The above refers to the latest data set)