It’s almost impossible to hit your target if you’re not looking at it.  Since you
shouldn’t make an adjustment unless you’ve thrown the ball pretty much like
you wanted to and hit what you wanted to hit, you should not make adjustment
until you know you hit your target. There may be something that will screw
you up worse than adjusting off a bad shot, but I can’t think what it might be.
If it’s difficult for you to watch your target until the ball rolls over it, try this.
Think of your eyesight as a laser beam. Watch your target make it smoke!
You’ll be surprised how much easier it is to hit when you’re looking at it! It has
probably happened to you that you are looking at your target and on the way
to the foul line it just seems to blur out and you don’t know if you hit it or not.
Lasering will reduce this phenomenon. It will also help eliminate the tendency to
pull your eyes off the target as soon as you let the ball go.