Honestly, you may be working too hard. It sounds silly, I know, but part of astral projection is about letting go of your physical body. If you are focused on perceiving the reactions and actions your body has, then you might become bogged down in your physical body, simply because you aren't fully letting go.
With your ears stopping you, why not try to come out ear first, rather than have your head come out of your body last?
As for the techniques, I use my own technique, which changes to the fit the situation at hand. Usually, I put myself into a meditative state, and simply let go of my physical body, at which point I feel myself pulled out of my body. I tend to be misty rather than appear as a person right off, and I simply gather myself together.