XB-40 in C: high notes squeaking?

Hi all

I've just got my XB-40 in C and I have had some trouble bending the holes
above 7. The notes squeak. It's even worse for the 10th hole where I have to
shape my mouth as for bending in order to obtain a note.

I'm a little bit surprise as I'm not too bad at bending and overblowing.

Is it only a technique problem or can I do some tweaking (gapping?) to
improve the response?

Thanks for your help


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