I seem to be doing fine with 8/4 (and thinner) white oak, bit some of my 12/4 slabs are developing surface checks. I sticker freshly-sawn lumber in an outside shed for a year, and then move it into/near the shop which is ~70% RH in summer and typically 30+% in winter. There's ample air circulation and no direct sunlight in the outside shed. Most of the wood is ~12-14% when I move it. Clearly it's not working for 12/4, although 8/4 comes out nicely stress-free. Any suggestions welcome.