For me it is an economy of movement "problem". Recording your stages can help you figure out just how fast you were moving or how many steps you took while shooting a particular portion. Shave off time by getting the little stuff out of the way and fast and sharp,IE, reloading. Then fine tune your mechanics. Pilates and yoga strengthen the core for leaning shots and lower body and upper body work manage recoil and smooth travel when shooting on the move.
P.S Ben is a Boss.