Some people just love Bernina... some of us have less glowing experiences. I have the 820 which was not a popular model, it was owned by two Bernina fans before me who each continued with the brand to happier results.
It looks from the pictures I saw that the 570 has the integrated walking foot thing, the arm that comes down from the back of the presser foot. I typically piece with that engaged. When piecing, I do use the single hole plate.
While I have some other issues with mine (like it doesn't like to "sew into space" and suck down triangle points), I don't have your exact problem -- but then I press my seams open and pin at each intersection. Hope you can figure out a fix.