I can report I took the rear heart and guts out of the car. I found the sponge padding under the rear parcel shelf to be gone or minimal everywhere. So, I padded it all underneath with cut up sponge pieces (kids bath toys!) stuck in with sticky tabs. It has reduced the vibration massively but I can still hear it a bit. I think I will just have to notch the subwoofer back a little bit and it'll be fine. Thanks gents.
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