Wrinkles along the luff indicate that the bolt rope may have shrunk. This can effect how the sail goes up. To fix it you'll need to undo the stitching at the bottom of the luff pocket, the row holding the bolt rope, and stretch the luff, allowing the bolt rope to pull up inside the pocket. You then push a short length of rope into the pocket and stitch both ropes back to the sail. It's not difficult, I do mine about every five years.

Cleaning and regular lubing also makes a huge difference.