In my upper register some of my biggest problem areas are the high f# and c. I can play chromatically up or down to the high f# and every other note is fine, but the high f# is hard to produce, cracks and is very airy (and i`ve been asuured that there is nothing wrong with my flute). also the high c on my flute is very difficult to produce (jupiter 711). i have a high c facilitator, but it is very hard for my pinky to reach, especially when playing chromatically coming off the high b natural. any suggestions?

also any general tips for chaminade`s concertino? any hints on counting the septuplets or the low e to low c# fingering?