How to improve the performance of my trucks?
How to fine-tune your skate trucks
To make skate trucks perform better, you may want to change pivot cups, for those aftermarket urethane ones, which will make turning much smoother and reduce slop  (Looseness in your pivot cup).  (Try Riptide pivot cups )
You also may want to change the bushings, according to your weight, and how loose you like your trucks. (Be careful to choose TKP bushings, that are a bit lower than those for RKP trucks.) Try  Bones bushings with their revolutionary “hardcore” bushings, which reduces slop, and doesn’t require bottom washer, which makes for nice smooth transition)