I really think that these very loving people, who are on this great forum and giving you some good advice, are your sign.
Just the fact that you are here on this forum and learning the truth about the "truth" is your way of reaching out to God and asking him for a clearer pathway to his truth, whatever that may be.
Those comments that were made by the MS and the Public Speaker was all (pre-recorded at the Watchtower Headquarters) carefully worded propaganda. And the fact that the talk was changed at the last minute and you walked in on the word "doubts" was in my opinion coincedence.
When one is having a serious issue within themselves and they start looking for signs, they super sensitize their emotional parts of the brain and start becoming aware of anything that points to their issue. In some cases that can be a good thing for example: if one has heavy financial issues and they pray, or for some other reason look for a sign. they will be super sensitized to see things pointing to a way out of their financial problems they may see an add for a budget planning company and getting their help to get out of debt. On the other hand someone may come along with some pyramid scheme and they are immediatly sucked in.
I know it's not the greatest comparison but I hope you get the idea.
The point is, I don't believe God is in some way throwing things out in front of you to get you to stay in the Watchtower Organization. However, if that is what you want to read into a few random things that pointed to the troubles going on in your mind. Then that is what you should do. But be careful because giving control of your life to anyone and you are giving your life over to the WT and not to God (just check the baptism question http://www.jehovahs-witness.net/jw/friends/18087/1/Baptismal-Questions-why-the-change as it now exists).
Your Choice
If you choose the Watchtower, your better stop coming to this forum. They forbid it. If you choose to continue exploring your beliefs and want a wide array of ideas and opinions then use this forum to make discoveries in thought and use every possible tool out there to discover new ideas, new possisbilites to start your search I think there is a Bible scriptue that talks about searching but never finding somthing about gold in there too
Any way, the best to you