Here's your problem. Your set up for the cork isn't that great. You don't have much momentum. The biggest thing is that, if you're swinging your left leg through, you must spin to the right. In this replay, you are swinging your left leg and spinning left. You'll have a lot of trouble if you do corks this way. Also, work on your timing. Have your arms reach their max height at the same time as your abs and hip is extended at the same time as your chest/pecs reach their rotation peaks. It's a lot to keep track of, but if you're like me, once you do your first cork, you'll be able to do them consistently and without much effort.
