This one seems even more relevant. One thought–I don’t know, but you may be over thinking / overdoing it with regards to relaxing the lips, etc. Greg does mention that we need to experiment–that practice is experimentation and finding what works for us, etc. Obviously if you’re not getting any sound out, that’s not going to work either. The answer might be somewhere in between what you’re doing now and what you were doing before. I think the above video and the below video are going to help me and thought they might help you as well. I’ve seen these before, but it’s been a while; I think I need to go back again and spend some time doing this again, etc. Best of luck.