The ‘Initial Offset’ value is how much to slide everything left or right, if your fills don’t correctly match a line. For example, if you set a square to do ‘Fill+Line’, and it ended up like this:
If the red is where the ‘Line’ part ended up, and the black is where it filled, you would use the ‘Initial Offset’ value to shift the black filled part to line up with the outline.
The first column, ‘Line Shift’, is probably the one you’ll need. That one is where you enter half the distance between the ends of the scanned lines at a given speed. You need to do at least two of them so the system can figure out other speeds. I recommend doing 100mm/sec and 300mm/sec. You can do more speeds if you want to, and the system will ‘make up’ new numbers in between them all from the values you give.
Does that make more sense?