Spectrum
Yes, you are right there is a 'tug of war' over issues of chronology not only between scholars over the Fall of Jerusalem in either 586 or 587 but between our sacred biblical chronology and those profane, secular chronologies of Christendom. These secular chronologies can only be understood by scholars and WT chronology can only be understood by the layman so it is as plain as that.
Christendom does advocate 586 or 587 and does not advocate 607 as you say but reason for this is that Christendom ignores entirely the biblical 'seventy years' of Judah so there chronologies are artificial and contrived as a 'deep thing of Satan'.
scholar JW