The presence of St. Croix leads me to believe that you have the same issue we have here in Minnesota- very short and highly inconsistent growing seasons. Which lead to (very) sweet wines more often than not.
Got to compare a bottle of 2005 Malvira San Michele to the new 2011. The interest being the 05 was 100 year old vine - which were torn up and replanted. The 11 is the first of the new vines. And you can still find much that is similar in the profile of each. Terroir FTW.