My favorite vault drill is double layouts off the trampoline into the pit, it helps simulate the landing and air awareness.
My favorite bars drill is a bounce to handstand (using t-trainer and a single low bar) We used it a lot for holding and hitting handstands in the lower levels which is a big asset for me now. I also love the tkatchev drill on the trampoline with a bar and a mat behind.
My favorite beam drill is doing my jumps onto a panel mat.
For floor I like doing bounce handstand double twists with a t-trainer and a block.