One common piece of advice is to slow down your backswing.  This is good advice if you are swinging too fast in your backswing that you end up swaying or getting off balance.  Many players take it to the extreme and swing back so slowly that they have no rhythm.  The swing is like a dance step that it is flowing, and not a move that goes from ultraslow to ultrafast.  Try speeding up your backswing a little to see if it helps you getter timing and more solid contact.  You do not have to race the club back, but think of a well-timed movement as a whole.