You make an assertion that there are "dramatic" changes in the text, but is that true?
Here is an example of analysis of the Great Isaiah Scroll from the Dead Sea scroll find. It dates to 200 B.C., only 500 years after Isaiah wrote the original and over one thousand years older than the previously used manuscript (used in the King James Version of the Bible).
Is that a "dramatic" change the closer you get?
Those who do things in a noble spirit of self-sacrifice are to be avoided at all costs. -- N. Alexander.