Heavens, ...the conclusion I draw from your explanations is that you are admitting that the JWs since formation from bible students days to present have been guilty of; misunderstanding, miscalculation , misinterpretation.
That's exactly why many here are ex JWs
By your own calculations you are reaffirming what we have known for a long time, thank you for your honesty.
You mention 1975 and that as you put it"sensational and immaturally expressed expectations" did not prevent JWs from further studying and improve understanding of the bible. Then how could anyone be expected to put trust in any current or future understanding by the so called, self appointed 8 men in New York who feed you THEIR TAKE on the bible. Try working it out for yourself and see how far you get?
It must be remembered all ordinary JWs have no say on the matter(I bet they wished they had in 1975).
And it must be asked by what method did they the so called FDS come up w this sensational and immaturally expressed opinion re 1975 as well as countless other miscalculations?
This JW hierarchical method has proved time and time again to be false and misleading. Whether well intended or not.