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Haha... It was an interesting read for sure!
Reading all that about Mazda heads brought me back to my former life! They are bad for gasket etching into the block as well. Aluminum head and Iron block syndrome. You pull the gasket off and it looks like it's still there!
Many people just replace the gasket and don't surface anything and the etching is so bad in the block it just puffs again.. however I don't think that is the issue here since it doesn't sound like a gasket issue.
However with enough overheating the head will warp eventually and blow the gasket!
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