If the PO didn't have the correct geometry it possibly could effect the position of the coil. Too far forward for instance. If they are sitting in that position for an extended amount of time it might cause a warp in the spring so instead of being straight up and down it has a slight bend. Just a thought, are your spring perches rotated by any chance? I would also like to see a pic of where it's hitting. Just for curiosity's sake.