I'm having exactly the same issue using S3D 4.1.2. THe part prints smoothly but the ooze shield printing feels like the machine is going to disintegrate! Firmware is Sailfish.
The reason is definitely the GCode which is printing lots of small lines rather than a smooth arc. It also slows down the printing compared to drawing arcs. Even longer lines would be better. The waterfall shape sounds like the bottom of the Niagara Falls!
Could this be considered for a fix in the next version?