Some drills you might try:
1) Walk throughs: Start behind the tee (in the batter's box) and walk forward towards the pitcher beginning with your front foot (left for RH and right for LH). You will take 3 steps. When you land with your front foot the second time, allow your front heel to plant and then check to see if your back foot "flowed" forward and raised up. If so, you will feel all your weight in the side of your big toe; hands above the back foot. Try it a couple of times without swinging and then use it with a swing to get the feel of your body's natural rhythm. Kind of hard to explain in words, but hopefully you get the picture.