The ram air or cross flow idea has a little merit, might be fun if you can correlate it to your speed. But it shouldn't stay wrong, once you at or near rest and there is no longer any dynamic pressure.
Another is that this specific mount might be inducing a twist or bend that strains the little pressure sensor
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."