I had been struggling with my short irons and chipping for the last few weeks. Discovered during a round today that setting up with my head a bit more down improved my ball striking for these areas of my game quite a lot! Think I had been holding my head too high and squinting down my nose at the ball! I realise that 'keep your head down' can be bad advice, but you should at least be looking squarely at the ball. 
