Very much appreciate you sharing your rationale. Hard to believe the majority of players have the fortitude or $$ to consistently play the verticals that way in a full field, and that may very well be part of the reason you find it more profitable to play that way instead of just playing the exacta and win pools. (Of course, picking the A horse is still the most important aspect.)
But if everybody played the verticals this way, I would hazard a quick guess that you would only average about the same effective ROI as a win bet?
Anyway, if a decent portion of the pools is played this way, then it stands to reason that predicting tri and super payoffs from win odds (and thus probabilities) will tend to overpredict payoffs for longshots and underpredict payoffs for favorites.
Not sure where I am headed with this. I have been playing the races for over 50 years and have yet to consistently turn a decent profit. Then again, I have not lost a house, restaurant, car, wife, kids, or even the shirt off my back.