Sorry, deathcape, I think you've managed to work yourself into a corner here. "Slow" isn't the whole of any strategy, it's just a component of some of them, especially since some bosses can get rid of the status (including Zeromus), and if you think that's the only element of strategy against, say, the four Elemental Fiends, I can see why they managed to beat the stuffing out of you hard enough that you had to grind.
You've pretty much openly admitted that you only grind because the game kicks the Hell out of you because you can't adjust to the ATB. That's pretty much admitting that this has nothign to do with strategy and everything to do with pacing.