My personal reasearch on this subject was very simular to yours but still i got a few new gems to add to it. I, too was amazed to see how easily and crafted the deceit was created.
They moved from a position where they saw all their predictions concerning 1914 failed, to a position that they saw their expectations fulfilled!!! And eventhough with little reseach one can find these contradictions (for example comparing staements from current WTs to the proclaimers book) hardly any JW knows about this. They are lousy researchers, not following the bereans in the least. The GB knows this and simply buries these admissions in huge texts of self praise. So when you do confront them they can say: "see we admitted it!" without a single JW being stumbled with these facts.
When I printed out my research and asked an elder why those contradictory statements were made I got no answer other then: "only we preach the good news! Only we use the name Jehovah!" etc "so we are the true religion, leave it at that".
Thanx for bringing this to our attention.
Greven