Aransu mystic badge is the strongest badge for now, so it is worth to get it. With 3 VT ss, 4's cooldown is 22.5 seconds. When you press 4, you can spam other skills like 2, lmb, rmb, or x. Of course, the dps will increase approximately 50k. With 8 VT ss, 4's cooldown is only 15 seconds. Your dps should increase 20k ~ 30k more (70k ~ 80k) since the X is getting stronger.