Interior Rearview Mirror problems of the 2007 Lexus IS250

Lexus is 250 manual transmission has so much vibration in rear view mirror, makes it nearly impossible to view out of at night. Lexus has attempted to fix this issue from the 2nd month I owned the vehicle and it still vibrates. Apparently Lexus had some sort of kit to reduce the vibration for is 250's that had excessive vibration in the mirror, however that did not relieve the vibration at all. All other Lexus loaner vehicles I have borrowed do not have this issue. I filed a report with " national dispute settlement ", since the meeting was during the day, the investigators could not see the excessive vibration that occurred while driving the vehicle at night and basically said the vibration was normal and due to road to conditions.