One of the major problems is orienting to the ball. In your practice chips without the ball, you will feel that the centre travels over the blade of grass you are focused on and your club faces the target at the finish. The swing is controlled by the centre with the relaxed hands going along for the ride. Essentially a chip is a rhythmic rotation away and towards the target which yu need to keep in your mind's eye as you swing. The ball is not to be 'hit' but must simply be passed through by the blade on the way to the target. Any extra movement of the hands can lead to a shank, usually because of fear of 'hitting' the ball incorrectly. The ball is not to be hit with the hands. The wrists should be firm. If you feel you can do an effective practice swing over a piece of grass and finish facing the target you must repeat that with the ball present. Simple, but not easy. let me know if this helps at all, ok?