Hello there, and thank you so much for the support! It really helps, I fund all commissions from Patreon so that takes me a little closer to getting more character art and much needed backgrounds.
Glad you're enjoying the game as well, I definitely wanted to do an adult RPG rather than just a porn game, so it always makes me happy to hear people actually like the lore/worldbuilding I put too much time into haha.
Vitality is a weird stat I confess. Originally it WAS flat (0.4% mitigation per point), but that made it utterly useless earlygame and OP lategame. A few months ago I changed it to the current version, which lets it kick in right from the start of the game and is slightly less oppressive lategame unless you put points into the tanky traits. Since you get more or less mitigation when VIT is higher/lower than level, VIT buffs and dipping into it can give a variety of mitigation rather than just the flat 30%.
I agree it's not perfect, but short of making it even more complicated I'm not sure how to keep a 10 point dip giving too many bonuses forever; vitality traits are already arguably the best in the game and a 10 point dip there is far more useful than a 10 point dip in any other stat even if the Vitality stat didn't give any passive bonuses at all. I am open to ideas though.