Howdy Formernuke, When I made the dry ice hash, I used approximately one pound of chunked dry ice with about one ounce of dried crushed (crumbled up by hand, looking for seeds) bud. The dry ice chunks need to be about two to three inches in size so that they have enough mass to knock the frozen tricomes loose, but not so large that they can damage the micron screen when shacking out the frozen tricomes.
I do not hake the hash any more because, in my opinion, it is wasteful (articles that I have seen all say to save the left overs' for edibles). I now, just dry, clean out any seeds, bake it, and grind it fine for caps. Works well for me and no waste!