Let me give you fifty cents worth of advice.
I wouldn't get too involved in KJVO threads or discussions.
What started in 2014 in the Fundamentalist area, bleed over to this area.
As a consequence, I have been on my own study on textual criticism. Its been 4 years now, and I'm nowhere close to an answer, with a few exceptions.
I do know the KJVO crowd, there is no changing their opinion. If, mind you, if their position is correct, "The KJV is the inspired Word of God" then what happened during the 1500 years prior to it?
If they are wrong, then Catholicism, and their tradition of "oral tradition" could be correct.
There are some problems with the KJV, one of the most noted, is the Comma Johanneum. (1 Jn. 5:7-8)
Prior to Erasmus, it didn't exist.
But, having said that, it does not mean that the doctrine of the "trinity" is not true. There are too many passages that speak of it.
The KJV is somewhere between 97.9%-99.7% true. It is reliable. But is it the "inspired word of God"?
No.
The only MSS that were 100% accurate were the ones penned by the Apostles themselves. And unfortunately, we lost them to time.
God Bless
Till all are one.