I already tried that yesterday but got fluctuations that are just as bad as picking the combos itself. A good number of times you'll get +1, -5, +9 for example. I think what this guy is doing is setting a trap as to when the smaller minus's occur.
What happenes is that a certain amount of times the minimal minus/plus occurs and you just keep playing them until your net catches them.
Maybe there's a way to track the small increments of the minuses like what Garyo has done and check off each one as they hit, then either play the overdue template combos or track and see which ones hit the most.
I may try to do a pencil and paper workout to try to isolate which small increment minus's hit and just focus on them. They have to hit eventually, so if I only have one minus template (one combo) to play, I can bet 5 or 10 bucks on that one combo and rake it in. Just a theory for now, but very plausible. The hits may be far in between, but the payoff would be very very nice.