I get so much from trees on my property I just stack them up and cover them with a plastic tarp for a couple of years then cut the slabs and sort through them

Microwaving works well. The method I have used is to put the rough turned items in a brown paper bag (top open) and then heat them in the MW until they are almost too hot to hold in your hand. Take them out fold the bag closed and let it cool. This acts like a steam kiln keeping some of the escaping moisture in the bag to slow down the drying of the surface wood. Repeat that until the wood is dry and then let it sit for 24 hours to stabilize. If during the process I notice small cracks forming I treat them with medium thick CA glue and that usually stops them from growing worse. The CA will react with the moisture in the wood and possibly give off vapors....don't breath them.