Check out these two links: 1) http://bassoon.com/Tuning-problems-in-general/tuning-problems-general-2/ 2) http://bluemountainensemble.org/page3/assets/Burns-Bn_Intonation_Issues.pdf If neither one helps, take your instrument to a repairman recommended by your local orchesta or concert band.
Sounds like a hole is plugged somewhere. Shine a strong light up/down inside it and see if you can see any blockage.
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