We've been at the end of Jersey week before - not this year - and crowds were quite manageable. Last I checked, NJ's "week" wasn't a week but just a couple days. (I didn't check this year).
I haven't checked a calendar to see when Easter is in 2017. Which week is it? Though many schools plan their spring break around Easter, some do not. If Easter is later in April than usual, then I'd pick Easter week. But if Easter is at the start of April or in March, then I'd pick Jersey week.
As for the 3rd week in May, the GA schools near me are out by then, but the SC schools are not. (And looking at the FL calendar, they aren't out yet either). The northeast kids are all still in school. The other side of things is the end of August - when all the southeast kids are back in school, but then you have to consider if you can handle the warmth.