Instead of leg curls on a machine I would choose Band Leg Curls. Band Leg Curls allow you to work to either side as well as straight up and down. And you can do them several times a week to bring your hamstring up.
Of course if you have access to Glut Ham Raise...I would increase the volume of those as well....
Of course if you have access to Glut Ham Raise...I would increase the volume of those as well....