Leander,
I was in your position not too long ago. I got to the point where my conscience would not allow me to give certain talks, conduct certain studies, or place WT literature in field service. At one point I just stopped turning in my time hoping that the elders would remove me. For at least six months I didn't turn in a time sheet, but the brothers didn't ask me to step down!
Finally, my father shared a letter of questions I wrote about the Society to my elders and they had an informal meeting with me. We all agreed that it would be best if I no longer served as an MS and my deletion was announced at the next service meeting. It was exactly what I wanted. Soon after that I stopped attending meetings. My wife and I are doing the slow fade out right now.
My wife and I had discussed these issues way before all this happened, though. Even so, it still put a bit of a strain on our marriage, but we are doing much better now. I would suggest talking to your wife about your feelings before stepping down so that she can understand where you are coming from. I tried not to attack the WT, but simply explained that my conscience would not allow me to do certain things because of what I had learned (I couldn't teach about 1914 was a big one for me). Certain things just didn't seem right to me. After sharing these things with my wife, and after some time she felt the same way.
I'm not sure what the standard announcement is anymore, but our P.O. just announced that I was no longer serving as an MS. The word "deleted" was not used. I was surprised.
rem
"Most people would rather die than think; in fact, they do so."
..........Bertrand Russell