So I am well into my shugyo and I have been playing about 5 hours a day at this point and I noticed a great increase in my stamina and tone, until today. It has been a rough day. I don't know if it is because of embouchure fatigue or being too tight. So I went back to long tone songs like Kyorei today and it has been loosening up. Reminds me of the old saying, "This to shall pass". Some days are good some are bad. When things seem like they aren't going quite the way I would like with my playing I change it up and do something completely different then what I was doing and it seems to put things back in order.