It's been a long time since I had to deal with my cylinder head, so forgive me if there aren't any dowels.
By the sound of it, it almost seems like there's a crack, somewhere. Also, check your coolant connections going into the manifold. (I'm sure you've done that, this is only meant to cover the check list).
Have you taken a mirror to look upwards to where the leak is? (Like a dentist mirror). This really is a baffling issue!! Keep us posted.
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