Hello again Valdy,
Yes, I have read this from OOB practitioners, that many claim to go out regularly but do not experience the vibratory state. Your experience of the OOBE is more evidence of this.
In my own experience, I have felt mild vibrations in the hands and feet when meditating (I can't feel the vibrations in the feet so much these days due to the neuropathy), but I have never been able to elevate these to a "kundalini" ecstasy, or an intense state which I can then transition to an OOBE.
Others claim this as their main method. They saturate themselves with the vibrations, increase them, then separate.
Having read Bob Monroe's method, it is very similar to Jeff's. It is the so-called "direct method," involving lying down usually for an hour or more, relaxing deeply. The idea being this causes the vibratory state which can then allow separation.
I would say the main difference between Bob and Jeff is that Jeff advocates for saturating yourself 24/7 with the vibratory phenomena. Doing this naturally produces nightly OOBEs for him. As far as I know, Bob never attempted to saturate himself with the vibrations full-time, and would not have meditated as much as Jeff.
William Buhlman, who was Bob's successor, wrote he could never make the direct method work for him. But, he used the creative visualization method (imagination being a faculty of the nonphysical consciousness) to induce vibrations which allowed him to separate.
Mike Raduga teaches classes on the "indirect method." The method of awakening in the early morning from sleeping, and catching oneself on leaving from REM and using that as a springboard to separate. He claims great success at getting people out using this way, and writes in his book the extreme difficulty of the direct method for most people.
I myself would be happy to just find one way that would work for me, haha.