I am also exploring the whole astral projection thing. I had never been able to get vibrations through meditation. Meditation was not something I was very familiar with in the first place. So I focused on trying to go from a lucid dream into an astral projection.
About my second week, I had a very different and intense experience in my sleep. I went lucid, and dreamed I was sitting in front of my computer researching astral, when all of a sudden I could see through the ceiling, and I saw the most clear and intense night sky I had ever seen. I then decided to go astral, when all of a sudden I was violently pulled out of the chair and slammed onto the floor. My whole body was vibrating, and I realized that the whole vibration thing was not as subtle as I had thought. It was the most intense feeling I think I have ever had. I was being pulled back to my body, and tried hard to fight it, but eventually I snapped back.
Keep in mind, the computer I was at is in my room, about 6 feet from my bed. After some more research about what had happened to me, I read about how people have a hard time getting away from the magnetic pull of their body. This is exactly what it felt like. I also read that the younger and healthier you are, the stronger your magnetic pull might be (I am 21). This is why many travelers are older, and even one of the experts in the field was bed ridden and sick when she learned how (don't remember the name).
Considering what I felt, and what I have read, there is little doubt in my mind that there is truth to this astral projection thing. I only wish I had more success at it.