The context would need to be evaluated in each verse you are referring to.
The translators wrote either LORD or Lord based on their interpretation from the context.
I would like to continue with the Hebrews scripture, and elaborate on the authors comparison of Jesus to Angels, since that is the one of the foundational scriptures you chose.
For to which of the angels did He ever say:
“You are My Son,
Today I have begotten You”?
And again:
“I will be to Him a Father,
And He shall be to Me a Son”?
6 But when He again brings the firstborn into the world, He says:
“Let all the angels of God worship Him.”
7 And of the angels He says:
“Who makes His angels spirits
And His ministers a flame of fire.”
8 But to the Son
He says:
“Your throne, O God,
is forever and ever;
A scepter of righteousness
is the scepter of Your kingdom.
9 You have loved righteousness and hated lawlessness;
Therefore God, Your God, has anointed You
With the oil of gladness more than Your companions.”
10 And:
“You, Lord, in the beginning laid the foundation of the earth,
And the heavens are the work of Your hands.
Hebrews 1:5-10
We see that the writer of the book of Hebrews seemed to be "weighing in" on a controversy about Jesus as the Son of God, and angels who are referred to as "sons of God".
- as He says... For to which of the angels did He ever say:...
Let's examine the scriptures in the old testament concerning
the Angel of the Lord.
Three different scriptures referring to three different manifestations of the Angel of the Lord being referred to as God.
- Now Moses was tending the flock of Jethro his father-in-law, the priest of Midian. And he led the flock to the back of the desert, and came to Horeb, the mountain of God. 2 And the Angel of the Lord appeared to him in a flame of fire from the midst of a bush. So he looked, and behold, the bush was burning with fire, but the bush was not consumed. 3 Then Moses said, “I will now turn aside and see this great sight, why the bush does not burn.” 4 So when the Lord saw that he turned aside to look, God called to him from the midst of the bush and said, “Moses, Moses!” And he said, “Here I am.”5 Then He said, “Do not draw near this place. Take your sandals off your feet, for the place where you stand is holy ground.” 6 Moreover He said, “I am the God of your father—the God of Abraham, the God of Isaac, and the God of Jacob.” And Moses hid his face, for he was afraid to look upon God. Exodus 3:1-6
and again
- 21 When the Angel of the Lord appeared no more to Manoah and his wife, then Manoah knew that He was the Angel of the Lord.22 And Manoah said to his wife, “We shall surely die, because we have seen God!” Judges 13:21-22
and again
- 11 And the Angel of the Lord said to her:“Behold, you are with child, and you shall bear a son.You shall call his name Ishmael, because the Lord has heard your affliction.12 He shall be a wild man; his hand shall be against every man,And every man’s hand against him. and he shall dwell in the presence of all his brethren.”13 Then she called the name of the Lord who spoke to her, You-Are-the-God-Who-Sees; for she said, “Have I also here seen Him who sees me?” Genesis 16:11-13
Then The Lord Himself,
the Spirit of Christ, through Zechariah also refers to the Angel of the Lord as God.
- In that day the Lord will defend the inhabitants of Jerusalem; the one who is feeble among them in that day shall be like David, and the house of David shall be like God, like the Angel of the Lord before them. Zechariah 12:8
JLB