Vehicle Shudder problems of the 2011 Volkswagen Jetta

Approximately a year ago, my engine began to give a clear sense of the car shuddering or rocking back and forth. While sometimes the feeling would occur even when stopped at a light, the vast majority of the time this occurred while I was driving at consistent low speeds. In almost all cases, I was attempting to maintain a consistent speed around either 13pmh or 30 mph. Eventually, I found the rocking motion very easy to reproduce. I'd set the car to 30 mph via cruise control and drive down a straight road with very slight upward and downward slopes. While it happens even on flat ground, I found that a slight decline is most likely to reproduce the feeling. My best guess is that there's something about the way the fuel supply system/transmission is trying to determine whether or not diesel needs to be supplied to the engine. The fuel supply system seems to almost cut out because giving diesel would produce a speed too high, and then it comes back on suddenly, because giving it no diesel would cause the car to slow too much. While sometimes this is simply a nuisance, I have had on many occasions felt that it was a genuine safety hazard since I couldn't predict how the engine would react. This in combination with overly strong engine break when letting off of the accelerator and delayed acceleration when stepping on the peddle that can cause inconsistencies and safety hazards when maneuvering in stop and go traffic on the highway. I've mentioned this problem every single time I've taken my car in for it's regularly scheduled maintenance. The vehicle has a diesel dsg engine, and as I've been told by service technicians and representatives, some of the things like strong engine breaking are associated with this type of engine. However, the car's rocking motion certainly goes beyond anything that could realistically be considered normal and safe.