I’m not actually sure, maybe max speed on the z axis, but that is all the same stuff I use and it’s smooth. Check to make sure 100mm is actually moving 100mm on your zaxis.
You could actually have petg, stuck in your nozzle. Run it at 245 for a while, a test print or something and make sure it gets cleared out. This sort of things happen when people switch between different temp filaments. The first layer should be running slower that why it usually works well , but after that can’t tell yet.