The math was calculated using SNG-PT, which uses Independent Chip Modelling (ICM) for its calculations. I won't go into detail about the nature of the calculations, but you can read about it here:
Anytime a push is over +.5 EV compared to folding, it's a significantly profitable push. You should not be missing out on too many of them.
Pushing with Q8o specifically (against 15% range):
Other hands you can profitably push here (against 15% range):