One thing I notice the other day was the difference in the time taken to pan from one target to the next. During a 4 seconds series occasionaly I will whip my arm/body accross to the next target in practically no time at all, causing me to come too far over, then over correct and be not far enough. Once a bad shot like this has happened you can bet your eyes will be at the target for the next one.

Instead of taking 1 10th of a second and raceing to the next target, slow down, pan accross smoothly in 3 10th's of a second. You still have plenty of time to wait for the shot to go off because your not over correcting.