I have a Z1 Platinum on my TT… get a bit of driveline noise at certain RPM when under load. Don’t think it’s DS balance but more from noise transfer; Nismo carrier bushings, aluminum flywheel, Pucked clutch. Not sure of others experiences but I may try putting an OEM properly match marked back on and see if change.
I’ve also been suspicious of the Z1 DS LENGTH, a bit of the yoke hangs out the tail of trans… as if there’s too little contact on where it seats in the splines and causes some noise due to vibration.