The lighter weight shaft moved the balance point closer to the head, increasing its swingweight. You can increase the overall static weight of a club by increasing shaft weight but it may move the balance point closer to the handle and decrease swing weight. Even though I’m a fast swinger and play X flex shafts, I play them at 120g. At 130g shafts, I end up losing the feeling of where the club head and face is. 120g shafts allow me to feel the weight at the end of the club towards the head.