Farkel --
Good post!
If you take a look at
http://www.jehovahs-witness.com/10/55372/1.ashx
you will see a chart I made last year which illustrates this very simply.
If you start with the WT's own date of 539 BCE and count backwards using WT literature for the lengths of the reigns of the kings, you will NOT reach 607 BCE for the destruction of Jerusalem.
Marjorie