Coolant leak inbetween head and block.

[Nostalgic]

I ran a decked block. You wouldn't think it would be enough to affect compression ratio and FCA, but it does. Not to mention alignment of your front gear train. I did the exact same thing as countless other guys - ignored Rawze and continued to try to make it right, doing it "my way". Spoiler, eating crow is unpleasant, not to mention expensive.

I can't see your videos. Only other thing I can think of, sans gasket being cause, is make sure your dowel holes are aligned correctly and the dowels actually fit in them and allow head to fully seat. I've heard of machining on aftermarket heads being off enough to cause issues.