Tame your front leg. Your front leg is way too active, and it causes you to open early, which is bad for a myriad of reasons, I'll split them into 2 groups.
Because you used your front leg to much, you opened up early, and causes you to basically throw it out to the plate. You lost any chance of hip to shoulder seperation which is important. You also lost energy that you may have gotten by an explosively opening right before front foot. Now, you lost the energy of opening your foot, meaning you can't keep your hips back, so they open early losing energy, and then you're upper half unloads early, resulting in unessicary stress on your elbow, and again a loss in energy. You also end up practically throwing your front leg to the plate. My assumption is that this is to gain stride length..? Reguardless of the reason, do not do this. Your leg should follow go down and to the plate, like an exaggerated J or L, depending on your preference. Keep your weight on your back foot, and use it to drive -- your back leg has more to do with stride length than front. As your leg comes out, it should extend, and then you should push off the rubber into foot strike with your back leg. You will get closer to the plate, and throw harder. Win-win.
Perceived Velo: This was actually something covered a few weeks ago in Coach Steven's daily tip. Your opening too early not only results in a loss of ball speed, but perceived velocity and deception. You need to stay closed, and then at the last moment fire your hips then upper body. If you keep your shoulders closed for as long as possible, you will create the effect that batters always talk about by saying "the ball jumps out of the pitchers hand".