On the subject of buffeting.. not high speed tho..
One thing for the 330 drivers, If you are on descent and use speedbrake 1/4-1/2 and notice any above normal buffeting you have a good excuse to have a chat with the guys/gals down the back of the plane. Ask them was there any buffeting.. Usual response is from the front.. a little (same as what ou felt).. from the mid.. nope all good... from the rear.. we were wondering when you were going to put the seatbelt sign on (difficulty in standing up). Ask your friendly engineer to check elevator actuators (all 4) and hinge bearing freeplay...