Through my own fault I came in high, and after trying to figure out how to make the way Radar Contact gives holds work with the 757 FMC, I just disconnected the autopilot and landed hands-on.  I did not want a go-around.  (Never did figure out how to make a hold stick that was described as so many miles on a certain radial.  There were places for input of that info, but I didn't see a place for the distance, and couldn't find an answer in the manual. Holds on arrivals that are anchored to intersections are easy.  Perhaps you have to set up a fix, then anchor your hold to that, rather than complete everything on the hold page for the way Radar Contact works.)

But during the time I was on the approach properly, I didn't notice rocking.

I wonder if it had something to do with the extreme lightness of the airplane at landing.  I suspect she likes being full and coming in at a planned landing weight of 165,000 lbs. for the 757-200.