https://www.sorbothane.com/Data/Site...properties.pdf
https://www.sorbothane.com/Data/Site...nce-curves.pdf
Their website suggests decoupling is acheived as long as the sorbothane reaches 10-15% compression. So according to them as long as you match weight, you'll acheive decoupling. Ive seen a few designers who recommend them, for what that's worth. The data on their pdfs looks good enough to excite my ignorant side.