>....they were estimated to have been from the period just after the fall of babylon. But perhaps that's not a good time to be copying.....
Sorry, this is your imagination and not correct. The tablets actually state when they were copied. One tablet was recorded in the 22nd year of Darius, which would be Darius II. Even the Insight Book I believe addresses this. If you look up this information in that volume regarding these tablets I believe they claim the writing can be consistent with all the way as late as the end of the Persian Period. But for some of them we don't have to guess or estimate when the tablets were copied. Some of there copied near the end of the reign of Darius II.
Now...once you understand the REALITY of the reason for the copying, which would be for the purpose of revision, you know there is no way these would have been revised until after the reason for the conspiracy to correct these documents took place, which would have been several years after the 14th year of Artaxerxes at the very latest.
Anyway, the Bible contradicts these tablets specifically.
1. It gives a 6-year rule to Darius the Mede preceding the 1st of Cyrus, which these tablets ignore.
2. The Bible indicates the 11th year of Zedekiah was the 19th year of Nebuchadnezzar and thus an 8-year difference. Thus the 37th year of Jehoiachin when he was realized (same year as Zedekiah's reign) would also be an 8-year difference meaning Nebuchadnezzar rule for 45 years and not 43 years. So we know on that basis these tablets were revised.
But just remember, anything that was "copied" has to be suspected of being a revision automatically.
In addition, the astronomical texts directly supporting this chronology do in deed reference the specific years of the current chronology, but ingeniously uses similarities in the original chronology to double-date these events, thus more than one date is extractable from both the VAT4956 and the SK400 and both align up with the same rule of Nebuchadnezzar which would date his 19th year in 529BCE. This is totally astronomical and totally independent of everything else. But when you add 74 years to get to the 1st of Cyrus, you end up in 455BCE, the date the Bible would have begun the 483 years until the Messiah (69 weeks) which would have occurred in 29CE. So at this point, there really is no choice about what happened and why there are these discrepancies.
Please also note that Josephus very much aligns his chronology with that of the Bible and claims a 70-year desert period beginning with the last deportation as the Bible does, thus 74 years from the fall of Jerusalem until the 1st of Cyrus. So there is secular chronology directly conflicting these tablets, but supporting the Bible. Which one is correct or likely correct is where the debate is.
But the recent evidence NOW makes it all to plain what the original chronology was, so it's just incompetent now not to recognize that 586BCE is a fraudulent, revised date.
LG