I think I'll put another 2 layers of b-quiet and see if it helps. From the looks of things I have my work cut out for me in making this car acoustically sound...The resonance is not only limited to the trunk. The front and back windscreens and all the windows in the car are flexing significantly (my wipers are also vibrating). The bumper is also a severe issue. The roof isn't a source of resonance but I'll still put a layer of b-quiet on there. I hope this works...