You can do hip abduction and adduction. One of the best ways i found was to wrap a mini around my knees while sitting, ass has be lower than your knees, and flare out.
Also, on speed squats and speed deads, use an ultra wide stance, this will incorporate your hips more and strengthen them. On your deads, be careful your feet don't slide, I dropped 365 on the side of my foot last week, it felt REAL GOOD!