I've been surprised at the 25 myself - though to be clear it's not that melty. Pretty much like your typical hash one used to get before bubble came along. Smells "traditional," which I actually quite like - and I smoke the 25 when I feel like I need shot of espresso as compared to a latte (melty). The sativa trichomes aren't melty, but they do work ;-)
As to why it comes out so clean, perhaps because I wash it with the ice water? Maybe something to do with the maturity/strain of the SD I use....