Googling the issue flags up possible dual mass flywheel issues... which is funny as it feels exactly like a small vibration i get in my caddy van at 2000rpm now its remapped which I was told was.... the dual mass fly wheel
Strange its started doing this just after the dsg service though? Does the dsg service go anywhere near the flywheel?
Will a reset possibly help things as I can take it back and get them to do the basic reset?