Can you post a factory file so we can see if the problem is in the model or the slicing settings? It kind of looks like the points at which the layer change is happening, but it is odd the way they are localized. Are there some more on the other side? You could try setting the layer start point setting to "Choose start point closest to specific location" and choose a point at the center of the front or back of the model and see if that helps.
The other thing I would probably try is to increase the retraction settings a bit.