The +MND on errant would most probably more than make up for the - VIT, otherwise go get a crimson body <_<... AF+1 head (or yigit) and Jet seraweels would increase your numbers quite a bit.
Do a cure with that build without bibiki seashell, then take off AF body and relic hat and put bibiki seashell back on, that'll give you 20 less skill and 1 more VIT, but you should cure for the same or higher (I think 2 VIT = 1 point?).
I'd also test errant because I'm pretty sure MND is a lot more important than VIT, otherwise I'm sure there's something else you can use (I use yigit body in my MND build for MAB on magic hammer lol, need to change that)