Drowning and vibration after hydraulic repair

Hello, as the first owner I have bought a 3.0 TDI GP2 from 12/2009 with 91,000 km. My warranty extension of VW goes until December 2015 to 120,000km. I recently had a defect at the steering hydraulics. After the first appearance of the Jaul noises I immediately drove about 8 km to the next VW workshop. Some hose should have been rusted. As a result the hydraulic oil was almost empty. As work scope I was able to restore the hydraulic system with Aust Since then it has been over with the outstanding comfort properties of the Phaeton. On the motorway there is a disturbance with vibrations as with unbalanced tires at all speeds and the car is very loud. Especially when it comes to giving gas, there is strong roaring. In the stand, vibrations of the engine are noticeable in the interior. During the ride I also have a lot of fun with 1400 – 1500 tours and with approx. 2200 tours. n Dröhnen even at speeds of about 50km/h. Does anyone have an idea ? Thanks for helpful tips