As side note, I had a really interesting experience with some older dry sift. About 3 years ago I made some Nevil's Haze Mango dry sift, it was my first try at it. The reason I tried dry sifting is because I had some bubble hash become moldy on me . So, ever since I started dry sifting, I haven't had any problems with mold. But the dry sift I was making didn't stick together well. If I put it in the oven (in a covered, shallow mason jar) I would be able to make it stick together by rolling it after the oven. So that would work, making it all into a small slab, but the end product would be rock hard. If one wanted to work with it for blades or a happle, then you'd have to cut off an appropriate piece and work it between my fingers. Otherwise one would heat the chunk of hash and crumble it into some weed or (heaven forbid) tobacco in a reefer or pipe.
Back to the NHM dry sift, I left it in my bedroom closet (1oz) and would rarely dip into it, by working the dry sift between my fingers as mentioned earlier. The neat thing is that all of a sudden, about 2 years later, I noticed the hard to work with stuff has turned into a malleable substance, like traditional hash. One thing I'm not sure about as far as important factors in this is room temperature. It was in my bedroom closet as opposed to the wine cellar, where I keep the rest of my weed. That may have a different effect, I don't know yet
So, from my experience, dry sift will produce hash that has perfect moisture content and if you have the patience, just make it and forget about it for a while, see what happens. Otherwise bubble hash will produce gummy sticky stuff right off the bat, you'll just have to figure out a moisture content that won't lead to mold