Good call. From my experience which is not too extensive with dry sift. Well actually I mostly make sift, but would never dare squeeze my grade a sift 99.9% heads. Absolute travesty to me. But I do press my contaminant and c grade piles. No matter what temp they always seem to come out a tad green. Again I never press the good stuff though. I also almost never press my good bags from bubble, but find my lower grades of bubble press out better than my lower grades of sift. Just what I experience. I have also played around with everything from tea bags up to 120u screen to press.