You mention that the Bible Teach book does not include references to the F&D slave, but overall references to the Slave have gone up. I have noticed a strong upwards trend to mentioning that the Slave is guided and must not be questioned. This is an important point IMO, similar to there being a Private and Public Watchtower.
I do wonder, however, if there has simply been a shift towards using F&DS directly rather than through more subtle forms of rhetoric. The Revelation book (1988) only uses the phrase 8 times, while the phrase "John class" (an alternative phrase for F&DS) appears 119 times. Also keep in mind that the number of references to the F&DS grew only slightly from the 90s to 00s. The 1980s seems to be lower, but my analysis is for the Watchtower publication only. Without a comprehensive analysis of say, all Watchtower study articles from the 80s through 00s, its hard to say exactly what has been changing. Real research can be pain in the...
In terms of what the group presents to new converts I do believe there has been a shift. I was a JW from 99 to 06. During those years I noticed a growing emphasis in the number of suggestions aimed at rebranding the JWs image. As a new JW I openly welcomed the suggestions, believing that they could possibly help break down stereotypes people in the field had regarding the movement. For example, here is a gem I remember from 2001:
*** km 12/01 p. 1 par. 3 Handle God’s Word Aright ***
3 Read Directly From the Bible: You might try going to the door without a book bag. You could put the featured literature that you wish to offer in a slim portfolio and carry the Bible in your hand or pocket. Then, when you engage someone in conversation, you can bring out the Bible without causing the person to feel that you are trying to preach a sermon. Position yourself in such a way that your listener can follow along in your Bible. Perhaps ask him to read a verse aloud. A deeper impression is made when he can see what the Bible says rather than just hear it from you. Of course, to help him understand the point of the text, stress the thought-conveying words.
In regards to your other point:
New recruits do not have the importance of the hierarchy highlighted to them. This does not become introduced until the recruit is already somewhat entrenched with the Organization.
I believe that in the era of GB 2.0 Watchtower teachings have essentially bifurcated. Essentially, there is an increasing separation between doctrines regarding the nature of God and his works from the narrative of the organization. In the days of Franz, Knorr, and especially Rutherford, the organizational narrative was at the center of the groups experience. Even the "Live Forever" book (1989) had an entire chapter about "Gods visible organization." I believe that growing anxiety about the nearness of armageddon is weakening the power of this narrative within the group, while shifts in societal norms render the story as less appealing to outsiders. Specifically, people today are less anxious about the perils of modernity (nuclear war, famine, destruction of the earth, etc.). Concepts linking mankind's salvation from these problems through a definable earthly organization may have less of an appeal. Of course, this is just a guess. There may be others reasons for why the two components of belief are splitting within the organization.
The response, however, has been clear. The organization has pulled back from incorporating the narrative of God's organization into its public message. And, as we have already noted, Watchtower publications have increasingly been focusing on generic discussions regarding the nature of God and morality. I am skeptical regarding the assertion that the Watchtower is simply playing a "bait and switch" on new converts. While this may be what functionally occurs, the true intentions of leaders within the sect may not be as clear. It's just as possible that they simply believe in a change of focus for the message, something that inadvertently creates gaps in what new converts learn about the movement. That's the problem with trying to judge the actions of GB 2.0, the are a secretive group of individuals that only insiders can provide the details on.
I also wanted to make a point about the growth of Jehovah's Witnesses in non-western countries. While the growth of western religion in non-western countries is often attributed to impoverished people grasping onto a fresh message of hope, there are multiple factors to consider. One factor I have though about is the Witnesses extremely Western image. Some of the appeal JWs have abroad may stem from new converts desire to become modernized westerners. This is just speculation, I have not data to back it up. A literature review on the growth of Christianity in the third world probably would reveal what really is going on.