1. http://startingstrength.com/resource...ad.php?t=50394
So, my comments are on the first video
2. Don't drop your hips low in your set-up. Bar and your own weight over mid-foot, shins touching bar.
3. Drag the bar up your legs - drag implies contact - and hit your thigh at the jumping position. It doesn't appear that you're touching your thigh with the bar before jumping.
4. Jump with straight arms, don't arm-pull to try to lift the bar up using your arms.