Vibration noise ar high RPM

For about a week a was getting a noise that sounded like the fairing vibrating around the headlight every time I had gone above 8,000 rpm. It would get so loud sometimes my mind would make the noise louder than the exhaust. Well, I tightened-loosened-tightened every allen bolt and it still was making the noise. inspected around the radiator area a dozen times and no luck. However, I didn't touch the under cowl because I swear it was coming from the head light area. Yesterday a small leaf was stuck to the underside of the bike and when I pulled it off I saw the under cowl move. When I changed the oil 900 miles ago I must have not tightened the highlighted bolt in the picture because it was 2 complete turns of the wrench loose. Took the bike for a ride and no more noise. I knew there was nothing wrong with the bike the whole time because it wasn't a sound that an engine and transmission makes but it did get kind of frustrating not being able to locate what part of the fairing was loose.