Now take this with a grain of salt I'm not a trap producer but from the trap music I have heard the bounce mainly comes from the 808,Triplet Hihats, & Snare hits. Drums are the priority in Trap music, the melodies are for the most part kept pretty simple. The best way to master the sound is simply try to copy a beat you like, recreate it if you have too that way you can fully grasp your mind around how these producers make beats. Practice on mixing as that is a vital tool as well. Keep at it yo!