I recently reclaimed a couple buckets of a variety of stoneware clays that I've been collecting over the years. All clay is the high fire, just difference sources and a small variety of colors, brown and grays. In the mixing process I did add dry fire clay to the mix (Hawthorne 35 mesh) to bring it up to a drier consistency, then wedged, and rolled into slabs. In working with the slabs, the clay was cracking as I was building, even as the clay was a workable wetness. I'm wondering if more wedging would be beneficial or if there is something else I could add during the mixing process to make the clay more workable. Thanks for any input!