Sounds right - the thick stuff will dry slow, also slower to cup. But
someone also once told me it's best to reverse the stack once a year.

I've got a stack of 300+ bf black walnut in the shed. Second time I've
done it. First stack didn't check a bit. But it is very damp there, a
creek runs right by it. So it probably helps a lot if the humidity is
naturally high - get a real slow cure.

tf