The standard 1/4" foot I use with my machine has a hinge in it at the 'ankle' so that it rides with the fabric, humps and all. Another thing would be to see if you can take some of the pressure off of your pressure foot. With my machine I can fine tune the pressure foot if I need to. Also, like mentioned above, see how you are pressing your seams so that they all don't meet in the same direction.