Why are you so obsessed with the preaching work? Doesn't it matter WHAT is being preached? Perhaps not, since you think the Mormons are sticking close to the bible (Do some research into their beliefs and the difference between their 'milk and meat.' On the surface it all seems so rosy, but in the deeper reality, it is very, very weird. So are witnesses' beliefs, actually). A cult is a cult.... does it make it any better that they are preaching far and wide? Does that make it more true?
Former brother, go walk into a real church and ask some questions.