Intuition is not guesswork at all and unfortunately it would appear that this is something that you would seem to have little experience of.
My practice is not guesswork, but I use my brain to work out what I am feeling with my hands, on what level the restriction lies, whether it is on a muscular/fascial level, an energetic level, or whether the nervous system is affected. I also use it to work out what part/parts of the body I then need to go ahead and treat.
It is an extremely profound treatment and the more I work with people, the deeper the treatment becomes. Sometimes they will need work at a more physical level and at other times they need a deeper treatment that will deal with emotional issues. I just follow where they need to go all the time.
The primary principle of craniosacral therapy is just being there and following the body wherever it wants to go and not imposing, however, I really would not expect you guys to understand any of this.
Yes and yes. There are trials that have been done by Upledger. I also plan to carry out my own research in the future.