It’s only 17/13 if you disregard the extra days you are required to do every few months and the 4 off periods disturbed by training and pointless company parties.
each of those 13 days loses between 4 or 5 days so at best with the 18 “off days” you must work you’re working 18/12 or 19/11 with precious little compensation for it.
It’s far from a bad company but if you look at the overall package for FOs NJE is miles better and other companies are offering substantially better money for similar roster patterns that are a bit less stable but still allow for paid leave Vista gives you zero leave because that’s what your off days are for... It isn’t Captains that are leaving, it’s FOs and if you look at that package in isolation Vista is terrible.