Got a spiral-cut ham? Oh, you fancy. But this beauty is a heat-thief. Those slices create cracks and gaps. Heat escapes faster, and the edges turn to leather while the center stays chilly. You must wrap it tightly in foil to trap the steam.
Check the temp in several places. Not just the thickest part. And never, ever trust the pop-up plastic thermometer that came with it. Those things are lying traitors. Use a real digital thermometer. You deserve the truth.