You can try to reduce the gap setting, you will see the effect by zooming a lot on the seam point in path mode, you will also see the depth effect. I think it's like a equilateral triangular shape, the starting point with the prime function pushing material to start, next the nozzle reach the path and at the end you have the suck function where the end stop.
It's closely link to your material with the Prime and suck function and it's why we militate to move them on the material tab.