It seems to be the case that a variety of persimmon will perform differently in different climates/locations. Hachiya, for example, gets larger in Southern CA than in the Bay Area. My sister has one in El Cerrito near the Bay that remains on the small side, whereas in L.A. I've seen them much larger.
My Triumph, by the way, is coming along nicely, but doesn't appear to be a vigorous grower. I'm thinking of adding a Winterset because I'm pretty thrilled that we can even grow persimmons in South FL.