Lubricate the Sucker.
Mine was kinda of slow and chunky when trying to close, tilt was also, Lubricated it with some bearing grease, and that sucker moves smooth now.
Lubricated the track, and the areas where I could see the tilt parts moving.
I'm sure there is some better grease to use, I just used what I had lying around. Plus I figured it should work well since its used for bearings.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.