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Distinguished SOTW Member/Technician
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Very possible. As he has mentioned not only have you shifted the centre but you have also reduced the venting ability. By reducing the abilty of a key to vent correctly you can create a hissing sound.

However In your situation, I think the location of the crescent may be causing a point of disturbance within the instrument and in turn disrupting the standing wave for playing B .. F# .. C trill

Simple to check, remove your G#and A key off and remove the crescent and see what happens
 
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