I suffered from a reverse pivot earlier in the year (trying to get my club to parallel, aka make a full swing), causing a leading shoulder dip, and all my weight being on my target side.

Here's how I got rid of it. (instructions for a right handed golfer) Without a club,reach across your chest with your left arm. Then turn your shoulders away from your target, rotating around your spine, turning as close to 90* as you can (don't worry about your hips - they'll follow). Feel where your weight is in your feet - it will certainly be more towards your right foot. You'll also start to feel 'tight' in your right leg. This is your backswing at its fullest extent - any more and you start a reverse pivot.