You have good technique and you move really well. I think it's important to remember that you're never going to be able to hit big numbers every time you go to the gym. So if you have a bad day, I wouldn't go and change up your technique. If you start with your hips lower than normal I'd say it's actually okay to brings the hips up a little in the start.
I do agree with Keith on this though. It looks like you are dropping rather than pulling down. And because of that, your turnover looks a little slow. Just because you're going to squat down doesn't mean you have to turn the bar over all the way in the bottom of the squat. Try turning the bar over sooner and riding it down into the squat.
Do you work the power variations of the movements?