My guibo went bad at approximately 120k miles and my car exhibited the vibration issues you described.
Independent shop replaced the guibo with a new OEM part and car ran without vibrations.
Similarly, we replaced the steering guibo and there was a noticeable improvement in steering lost motion and overall feel.
Those simple parts get worn and beat-up. Disturbing the drive shaft guibo probably put an already high mileage guibo into failure mode.
2004 CiC 6MT Silver Gray (A08) Black Interior 1 of 51 Made
Intravee - Navigation - Back-up Sensors - Cold Weather Package - Home Link Mirror
Winter Hardtop, too - A Sweet Ride