I think (I could be mistaken) that "one substance" or "consubstantial" is taken from the Nicene Creed which you're already well aware that I disagree with on one major issue. IF this is what it's referring to, THEN it's referring to the time when Jesus was allegedly "eternally begotten" which is a load of rubbish. Everywhere in scripture, as you and I have previously discussed at length elsewhere, when the word 'begotten" is used in relation to Jesus Christ it is referring to the day in which he was raised from the dead.
"Hypostatic union" simply refers to the combination of Divine and human natures in Christ. That, I agree with.
"Economic Trinity"? Have no idea, and I'm not even going to look it up. For me, my "economic trinity" is paying my rent, heat, and electric bills...lol.
What's the earliest that I can call you tomorrow?
I have a strong feeling that my son is going to want to go to the gym with me tomorrow at around 10:00 a.m., so we'd need to talk before then.