Are you sure you're in mind awake/body asleep? Normally itching and wild-mind happen as you begin to enter trance, before MA/BA, and indicates that you're not relaxed enough. For me MA/BA (F10) is a comfortable, relaxing state, either to begin an AP, reflect on things, or just relax in it and experience it for what it is.
If you're sure you're at MA/BA and still have these problems, maybe do some concentration exercises for a while to help keep your mind focused during your AP attempts.
One last suggestion: If self-hypnosis has become your dominant method, try a different one. The hypnosis may have less effect on your subconscious over a period of continuous use.
Ok thanks.