Osu! Training training training! Thats the only thing that helps. When you make the kick. You know all the importent things when you do it. (the hip twist and so on) But a lot of the speed comes from the knee. make sure you make it fast. Lift the knee to your side, do the kick, and make sure to put the foot fast to the ground, or else you can get a VERY bad happit, which slows the following move a lot.