If you have trouble with your chips and pitch shots you may be moving your legs too much and dipping your knees and changing your body center. Practice this to become more stable and in the right place to get better strikes.
Focusing on your right arm can be the way to save your short game- especially the pitch shot and chips from near the fringe. Watch this video to learn how players such as Jason Day eliminate the bad short game shots via their technique
Luke Donald has always been recognized with having one of the better short games on tour. He recently posted a video showing his pitching action- and a great way to train how to use the bounce correctly.
The short game is all about confidence and trust. Growing up in Melbourne I was always better at the chip and run shot than the lofted shot. The courses I played gave me this option so I played it more and knew I could play it well.