Hmmm, interesting, I myself seem to get the best full melt hash by putting the fresh trim into the deep freeze (not a wimpy fridge freezer) for a minimum of 2 weeks before processing. By freezing fresh I feel you preserve some of those essenial oils and essences that could dry up along with the trim, and leaving it well frozen for that period seems to make for a more complete and clean extraction... in my experience.... with my herb.... grown my way.
(well, and the friend I borrowed the technique from) Just my 2 bits.
YBG