Mango cultivars can have off-seasons. Growing conditions, climate, macro/ micro nutrients etc etc. One year they perform/taste mediocre. The following year(s) they are spectacular. Some mango cvs can "perform" more consistent than others. Ice cream mango, as an example, this years for me has been the best ever (6 years). Decent production (uncharateristic) and top quality tasting. Brix in the 23s.