Hi Chris,
Thank you for your suggestions. One of your comments were particularly useful, namely fixing the tip of the toungue very close to the tip of the reed even when not articulating. I have had a tendency to try to move the toungue in my mouth to form the sound. This has probably disturbed my embouchure quite a bit. I did try double lip for a while some years ago, but dropped it when a teacher adviced against it. Now things work better, so I think I will stick to single lip for the time being. BTW, looking forward to a concert in Oslo with Martin Frost late in September. Thank you!