Hey my man if you're going to practice to work on a new aspect of your swing, I wouldn't worry too much about where you're throwing the ball on the lane. Just work on what you need to do.
I can tell you when I was in the biggest slump and bowling like pooh, I taped myself and found my backswing to be way too high. I was forcing the ball down at the top of my swing and it really messed me up.
One thing I would suggest, as others have said about the muscling the ball back into your swing, is to take your ball, hold it in your normal starting position, and push the ball up and out and let it fall.
If you have a 4 step, do it as soon as your first step starts going, 5 step, obviously on your 2nd step. Let the weight of the ball do all the work for your swing. If you push the ball up and out, somewhat in a circle, and let it fall back, then swing forward, the muscling will dissapear.
Go on youtube, and type in Parker Bohn instructional video. I know he's a lefty and most likely you're not, but just watch what he does, it will help explain more of what I am talking about.
If your arm swing is free and loose, it is easier to repeat shots..
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Ahhh Disco Biscuits!