I think writing a letter, expressing your feelings as a human being and not being repressed by restrictions the WT has tried to ingrain into our brains is a good thing.
That is what the WT does... it tries to take humanity away from people. It is comforting to hear that you have chosen conscience over relationships... that is what truly improves the world... people like you.
You will never have to wonder, "I wonder what would happen if?" You did it, you wrote the letter! Good for you! They will have no excuses.
Very nice letter,
Cha Ching