I'm glad I read this before posting my next thoughts on the Scorpion.
I've been looking at sound deadening in the boot and creating a barrier but can't quite pinpoint where the noise is actually coming from.
It's driving me slightly mad, the resonance in the cabin is at its worst when slowing down from 30 to 20, it goes right through my head. I even installed a decibel app on my phone this afternoon. I'm averaging 93db with town driving, stop start up to 30mph. I'm hoping it just needs running in as has probably covered less than 60 miles.
Good point about the mounts though, not sure how much they can affect it? Probably negligible