Try loosening the screw that holds the needle, and rotate the needle a small amount to the right. Sew with it and see how it does. If that doesn't work, try rotating the needle to the left a little. I can't really see anything wrong. It really has to be something simple. Are you winding your own bobbins? If so, find some pre-wound bobbins and see how they work.
No one lives forever, the trick is creating something that will.