Well the good news is that you don't look like you are trying to throw the ball, and your swing looks somewhat free. Now as far as fixing a few things lets start.
1- A bigger push away with the ball at the start of your approach would be good. Rather than just letting the ball drop straight down, try to push the ball out as if you are trying to set it onto a glass table. I think this will help with your feet being a little fast.
2- Your third step is really fast, it would be better to try and slow that step down, as this is where all the power of a bowling release comes from. This is the power step, where you "coil" up and then unload into the foul line. The longer you can make this step, the more stable and powerful you will be at the line.
3- Follow through is really short. It would be better if you tried to extend it up to shoulder height and let the elbow break slightly, then recoil back and forth keeping that free swing mentality.
4- Keep your body down at the foul line. If you watch you are "popping" up at the line which is usually a symptom of yanking on the ball a little bit. This might not be what is causing you to end taller than your slide, but you should be down at the line, well balanced and posted. Remember you are throwing a perfect bowling shot so you have to give those camera
men plenty of time to get a good photo haha!