The reason you're jumping forward is because you're initiating the extension too early causing you to throw your hips forward into the bar.
Bring the bar back into the hips more and keep your weight back longer before exploding up.
Also, I would try to keep your vision focused straight ahead before lifting the bar off of the floor rather that looking down. Looking down tends to make people shift their weight forward or (in your case) jump forward on the 2nd Pull.
As for the second video...
I would call that a good lift because it just looks like your shoulders move instead of your elbows but I think it's going to depend on what kind of judges you get.