Here is a great video discussing correct foot placement, weight distribution, and how to exicute the split. These techniques have worked great for me so give them a try, keep in mind that every coach teaches it different so use what truly works for you. Just remember if you want to get better learn from the best. Take note of the jerk exercise he shows at the beggining, I refer to it as a jerk drop, like a snatch balance for the jerk. Great exercise to work on foot work and speed under the bar.