You have a slight weight shift towards 2B at the start of your delivery. That can contribute to inconsistency and it gives baserunners a jump start if they know to watch for that. Try to make sure everything moves only towards home plate.
Also, I think you need to get your center of mass moving forward sooner and faster (be more aggressive) and lead with the front hip more. Use the Hershiser drill to practice making this change.
You might find it helpful to start is a more athletic position (i.e. put some more bend in the knees and waist).