I normally start the mod (atc / def set to 5, and no sp skill) when I saw kiana on the deck, then leave it as it be the whole time, including events and rank, except those stages where combo is needed and my setting of atc / def is too high, I'll reset it to a smaller amount during the battle...
Same here, just got banned today, have too wait till July 7 to be free, maybe I'll forgot about the game by then, well, that's the risk.
I think I may got all out for it, I usually put 5 for atc and def, plus no sp. Sometimes when in hard stages, might get till 30++. And I did use a lot in co-op...