check your shaft flex and weight - lighter, softer shafts can make a big difference in trajectory.  Make sure your shafts fit your swing speed and tempo.
Drill:  put a second ball, or headcover, a few inches behind your ball and try to hit low knockdown/punch shots (feel like you are keeping your hands below your beltline at the finish with pitch shots).  It can also help to put a tee in front of your ball a little bit and try to clip the tee out after contact.