Just a question.......might you have accidently used garlic salt instead of powder? From your recipe, it doesn't seem like it would be very salty.
Nope...
No Garlic Salt permitted in the house because it is mostly salt.
Galic Powder, not granulated but the dusty stuff. I've found to maximize a garlic flavor that the powder is best. Granulated is a waste of money and fresh is good when you smoke or sautee whole cloves (don't wanna be around me on the day after I've eaten a bunch of fresh garlic sautee'd to a nice caramelized brown - a particularly unpleasant smell emanates from both ends )
I believe the source of the salty taste came from the teryiaki. Totally dried and all liquid removed the little salt it has comes out.
Now after almost a day of sitting in the fridge one can barely taste the salt.