Vit just depends on the build. For example, 50 is pretty low for an elemental vit gouge, but it's decent for a quality or strength build. I found that it's not that important, if your build compensates for it with either mobility or high damage. A dex/faith doesn't need a lot of vit because it can 3 shot people with an SLB'd falchion. I'm gna make a glass cannon that has max HP of 135 or so and uses no armor besides the dusk crown. Sure, people can 1 shot me, but I can also 1 shot them. Not to mention, it's great dodging practice. If you can dodge any and all attacks, you don't even need vit.