I think I will try pressing them open and see what happens.
NJ, I am chain piecing. Now I am using a leader in-between each section to minimize the "eating". Never had this problem before with my old Bernina, even with other triangles. There is just something about the angles that my machine doesn't like. I would switch to a single-hole throat plate, but I have to move the needle to the right to get my scant 1/4" seam. I do think part of the problem is the zigzag throat plate.