They will probably settle after a bit of driving.
HD's will be a stiffer shock. I would be asking what will happen with hd's int he front and comfort in the rear? Will that adversely affect ride / car handling?
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.