So, I've finally, after months of diligent practice, developed a kick serve with quite decent (6 foot) kick. There's just one problem. It's ludicrously slow. Against inexperienced players, it's no problem, but against 4.0+ players, it's just asking to be slammed for a return winner, every single time. The problem is, when I try to swing any faster, for more pace and (ideally) spin, I shank it. Big time. I was wondering if people have experience with this and could help me?