JT,
Correct me if I'm wrong, but the equation with a pure jet would be a bit different - because jets generate thrust not power. I would think that with a higher aircraft speed the engines would add more energy per unit of time. More energy = more time / options.
I think someone killed themselves a number of years ago here in Aus using a technique like this as their regular technique - they didn't push forward quickly enough after the zoom - stalled, spun, crashed and burned.