I've only tried the thunderclap,tanglong and hualong but at your speed, the cube with the best cornercutting and speed for your turning style is probably the tanglong or thunderclap. If your can afford more, get the tanglong. If you are on a budget, get the thunderclap but be warned because it is very hard to tension(due to the centercaps). But, from a cube not in the list, I would recommend a YuXin. It's easier to tension and it's at moderate speed. Amazing cornercutting as well.