Have the Chosera 1k, naniwa ss 1, 3, 5, 8, 10, 12 and soak the lot often for 15 minutes or so still they stabilize just like Glen does in his YouTube vids. Once done dry off and pop on the table till dry and pack away. Never seen any sgn of twists cracking or crazing.

They do seem to react with water and swell? Might be something in the splash and go just swelling the surface while the rest stays rigid and dry?