Weight wise, The ST is a lot lighter and the kick is much lower. I messed with some ball positioning and grip this week and it seemed to correct it a little bit. From what I talked to my coach about, He says I am opening the face either too much on the down swing, moving my hips to early, or I am paying it too forward for my swing. It's gotten alot better since October about these issues and hoping that it continues to stay this path.