Doug:
Thanks for your comments. I hope I didn't convey the idea that you don't consider the context. The responses you got seemed to miss that aspect so I thought I'd add that part.
I have two full commentaries on Jeremiah - NAC and NICOT. I also have some that cover larger sections of the Bible including Jeremiah. I notice in the NAC and NICOT there is a lot of discussion on the possible sources of various sections of Jeremiah. Apparently the LXX leaves out completely vss.14 - 26 of chap.33 (as an example). So, you got your work cut out for you.
I spent my first couple of decades as a JW simply taking in the 'food' handed down from Brooklyn. Several things triggered my 'independent' study of the Bible. I naively thought Brooklyn loved truth. I found out they love only their version of it. And they resent any attempt on the part of others to find out more than what they know (or think they know).
I wish I had started a more determined study of the Bible earlier. But if I had, I probably would have been branded an apostate by now. My growing independent study sort of parallelled my growing awareness that it wasn't appreciated. At present I am careful about what I am learning, but I can forsee a possible collision with the powers that be at some point.
Take care.