Vanderhoven7 I wasn't aware of Zechariah 3:2 (1977 NASB) saying 'And the LORD [Jehovah] said to Satan, "The LORD [Jehovah] rebuke you Satan! ....".' The 1984 NWT in that verse says 'Then [the angel of] Jehovah said to Satan: "Jehovah rebuke you ...".' I can see how you and could see Zechariah 3:2 saying that it speaks of two persons named Jehovah in light of what verse. But until I see more evidence for that view, II think the NWT's use of "[the angel of]" is likely correct in that verse, in light of what verse 1 says. I think another possible way of interpreting the verse could be that Jehovah God the Father is saying that he himself rebuked Satan. In other words I think that a translation expressing the meaning of verse could possibly be accurately worded as follows. 'And Jehovah said to Satan, I Jehovah rebuke you Satan! ...".'
Another thing to keep in mind is that the Greek Septuagint likely says "Iesous" ["Jesus"] in verse one in place of "Joshua" since the name Iesous/Jesus (though not referring to Christ) is the Greek transliteration of the name Joshua. Interestingly the NT says that Jesus Christ is a high priest.
That verse can be understood as an individual (not named Jehovah) acting on behalf of Jehovah, and as result the credit is given to Jehovah. That view is like how human rulers are often said to have taken various actions, when literally it were persons under their authority who literal took the actions, acting in behalf of the rulers.
The words in Hebrews 1:8 which say "Your throne, O God" ["God is your throne" in the 1984 NWT) are a quote of part of Psalms 45:6. I have done research about that I have concluded that the translation of "God is your throne" of part of Psalms 45:6 is a plausible one, referring to a person (the Messiah/Christ) receiving his kingly authority from God the Father. But I can also see the plausibility of the idea of the Messiah being referred to as God.
The passages you mentioned from Psalms in reference to Hebrews chapter 1, as well as what Paul said in Romans (about Jesus is Lord (Jehovah)), and some other verses caused me (during the latter part of the time of me being an independent Christian) to conclude there is some support for the binity doctrine, for part of the NT saying that Jesus is in some sense Jehovah and can thus be called "Jehovah", and that it is OK for a Christian to pray to Jesus and to worship Jesus. As a result, as once or twice I prayed to Jehovah before I became a convinced atheistic naturalist.