Why not just replace them with OEM mounts. Will be firmer than the worn mounts you have now???
I did that, but they just don't last! It's the gearbox one mainly. It's utterly useless. They had to make it really soft because the gearboxes in MK5s are proper agricultural and transmit too much noise and vibration into the cabin. The engine side one isn't too bad.
As Rich said, move away from OEM and you will notice it unfortunately. Just depends on what levels of NVH people are prepard to put up with, and bear in mind rubber stiffens the colder it gets, so a slight dash vibration over summer will get worse in winter.
VW just need to design the mounting system properly to begin with, such as a 4th 'snubber' mount at the front that sits in a cross member to eliminate the irritating back and forth rocking.