Of all the things to say "I might rather use this", Cure is not one of them. At all. Unless you don't have Stoneskin, there's no reason to ever Cure. Even crossclass Protect is more useful.
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Use it if you're min-max, don't if you're not. The damage increase is small but there are very few fights where you will be TP starved. As for the TP cost, I think it should stay the same just so people will have to actually decide which fights they should and shouldn't use it, as its definitely a DPS increase.