On chords I am comfortable with the deep relaxed mouth technique. I’ve been struggling with single notes though.
I can get clean sounding notes, even on the 2 draw and 7 blow. But I find that if I take care to start out with good lip position (deep in mouth, tilt up, make sure lower lip is pulled out), as soon as I start to move the harmonica left and right it’s like it starts to slide out of my mouth. I lose the lower lip and my top lip tenses trying to hold the harmonica in place. After a few minutes the muscles around my mouth are pretty sore and tired.
Is this just a matter of practice, or am I building in bad habits by missing some technique?