Leander,
something to think about:
I have reached the same crossroad many times in the last few months. Then I move away from it and come back. "Just take it slow" was the advice given to me and it has been so helpful.
Take it easy - just cut back in the amount of time you want to invest in running around after an agenda you are unsure of. Take time out for yourself - an unspecified amount of time and just try to feel your way around.
Specifically to your points:
"But on the other hand I can't ignore things like the fact the organization is growing while other religions are on the decline. "
Thats not true any more. Look at the declines in the western world. Wait till January and look at the service report. Look at the pioneer hours - they cut them by 35% and guess what? No significant rise in the number of pioneers.
"JW's have learned many things about the bible that other religions don't know". I used to think that too - until I started questioning the Bible it self. Take Noahs Flood - you think that whole episode makes sense? Revisit the issue of universal sovreignty and free will.....they seem logical to you? Just start one issue at a time. Do the research!! Its fun and its freeing.
Your current research on 607 is a good point. While doing it think about the implications. If the society is incorrect on 607 then 1914 does not fit the prophecy; if 1914 is wrong then so is 1919 and then the Faitful and Discreet Slave - oh boy. Finally if they are not the faithful and discreet slave then how can you believe anything they say?
The reprint issue: an example: look at the 1989 watchtower January 1. Page 12 paragraph 8. The individual magazine when it was published said the preaching work would be "completed in our 20th century". When it was bound - that phrase was changed to "in our day". There is an original scan available from Alan or Kent of the individual magazine.
Your final point: Yes they lie!! Look at issues like the voting issue; Look at the blood issue and their deceit in Bulgaria; Look at the UN issue right now; Look at the "new light" concept. Some of their teachings costs people their freedom and their lives. Then they just change it and move to a "new light" stance - one which would have alllowed people to stay alive if they had that viewpoint to start with. You ever seen an apology for the fact that their OLD teachings cost people their lives or their freedom? I haven't - and it cost me in this regard. You ever seen an apology for 1975? Me neither. We could go on for pages and pages.
Leander, Take your time.