when it comes to producing melty dry sift, I find the strain used is less important than the mesh sizes used in relation to the trichome size, correct damage-free storage of the material and the technique used. A gentle technique used to small amount of quality dry sifted resin is what you should aim for.
grinding up your material then trying to separate the rubbish is more difficult than not letting in all that broken up leaf matter in the first place.