You have a resonance that is close to F# on your bass body that is very "easily" excited. You may be able to locate it and damp or change the frequency so it doesn't boom. I would start by having someone else help you find the resonating part by pressing in different places while you play the F#. If you find it by pressing on the top, then you can add some mass to that area in the form of sticky tac, plasticine or some other heavy clay type stuff. Once you get the right weight in the right place you can take the top off and glue in some wood inside and that damp it or shift the resonanct frequency of that mode of vibration. There is also a relationship between adding mass and removing stiffness. So that would be another possible approach. If you can't find the resonance by pressing on the bass body, then it is an air resonance and you can test that by taping over one, some or both ff holes.
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