Frixion pen work great and as they will be in you seam I wouldn't worry about the line coming back. I also use just an ordinary lead pencil on light coloured fabrics. You could also try marking your sewing line rather than the centre line and see if that is easier for you. A little ruler like this is great for that
http://www.joann.com/omnigrid-clear-....html#start=11 I sit in front of the tv and mark a heap of them and then sew them.