You sound you have a reasonable wife. I think your idea of leaving things out for her to find herself is a good idea. Sometimes you need to give them an "out" and a way to save face until they are in a place where they are wiling to consider the possibility that your points have some merit. My wife came around quite quickly because I'd ask her questions about things that weren't making sense to me anymore. I'd let her know when she expained her understanding of things to me, that I could see her point and then I'd show her the alternate explanation I wondered about and then I'd leave it at that. Pretty soon she started hearing the holes in the logic being taught from the platform on her own after I had stopped going to meetings.
One thing you might remind your wife of (if you haven't already) is that JW's beleive the end is near and it is imperative that each Witness spend as much time as posslibe in spreading the "life saving" message from door to door. They believe that anyone not heading their message and not getting themselves out of Babylon the Great will share in her destruction which could happen any day now. They believe they could lose their own lives if they don't participate fully in spreading the message. To believe this and to go around publicly recommending ones way of life to others, is to also say that you yourself and those in your religion have it made and everyone else had better make some big changes....quickly.
Ask her if she thinks whether or not people who have no religion at all or don't belong to a church will be spared at Armageddon since technically they aren't part of Babylon the great.
Ask her if a person would be better off at Armageddon if they had never heard the "message" at all compared to someone who did hear the "message" at all and refused to accept the "truth".
Ask her if she had to guess, who besides Jehovah's Witnesses, have a good shot at surviving Armageddon.
Ask her if because of all the recent changes in the Societies understanding of certain doctrines, whether all the Witnesses from the past who died believing they were worshipping god in Truth, were in fact displeasing to Jehovah since they went around teaching things that are now considered falsehoods.