Hey hudE, if these are the skis you are thinking of I would be going the Think Evo II, I reckon it's the best bet for someone with some stability but not ready for an elite ski. If one were around when I was looking I would have got one over the V10 sport.
The Vault is a true intermediate to elite ski, it feels like an elite ski on the flat with a few twitches but it has better secondary in the rough stuff, which is where it shines, that's why so many stories from reviewers and race results show the Vault right up there with the best. Just check the Carbonology facebook page to see all the races wins and podiums it has has over elite level skis.
It really is splitting hairs when it comes to this ski, in fact if you put someone with a big engine in the Evo II or V10 sport they will beat most local paddlers in races, as you say it comes down to how you feel in a ski.
Don't discount the Vault for remounting, yes I initially had problems when in big conditions (3-4m swell, 20+ knot winds), but could get back in within a few attempts, but after a few months I could get back in first time every time. The deep bucket, keeps the ski very dry in rough stuff and actually makes you feel very steady in really big conditions.
The only reason I am looking at an elite ski is that on the dead flat it feels like it is giving away (perhaps) about .2km/hr, doesn't sound much until you are racing other elite skis over marathon distances in flat water.
On rough stuff that hull speed can quickly become, oh my God how do I stay upright, as the more steady skis paddle away from you