Which head gasket is which in your pictures?
What is slipper plate style?
The one on top is the one from engnbldr's kit (I think it's a DNJ label) the one in the middle is Toyota OEM, the one on the bottom is the Fel Pro PermaTorque.
The Slipper plate design in the DNJ and the Toyota have the metal layer on top facing the bottom of the head when installed. The design is supposed to allow slippage on the gasket surface while the coefficient of expansion is about 1.5 times more for the alloy head than the cast iron block. Theoretically, the metal sheet is supposed to prevent the tearing of the gasket surface as the head expands and contracts. But some experts say they are more difficult to get a good seal and they tend to leak. I'm sure there is plenty of debate on this. I've read 1000's of posts on the discussion on head gaskets.
I'll post more about this later.