Judging from your preliminary tests, stats don't make as much of an impact as it looks like (which can be a good and bad thing). With 60 less VIT I'm taking only 6% more damage. If you're minmaxing I suppose that matters, but it seems like in casual play (anything not related to Dzmael, Ifrit, or Moogles) you'd be wasting a lot of effort (and possibly money) trying to get the extra VIT to make yourself more durable.

Good stuff as always though, keep it up.