I feel like the wine from the harrop is going to drown out any potential while from the diff.
I have solid diff bushings with subframe, CF driveshaft, and Ron's ssk with 95a bushings. It's all very manageable as daily.
Only experiment I reversed were AKG 95a trans mounts, those were insanely loud. Went with rev shift 80a Mounts and they're perfect.