Brick,
Most likely, changing weight to 15lbs will not have the effect you think it will (reducing muscling). If you have late timing in your approach leading into your slide you will muscle the ball no matter how light or heavy. In fact, reducing the weight might be more benifical as you will be able to muscle more effectively and correct or make up for the late timing. By increasing the weight you might have the reverse effect of constantly sending the ball right and not down your target line.
Muscling is do to a mechanical problem and not a weight problem. If you simply allow the weight of the ball to swing your armswing and start the ball at the proper point to complete the swing as you complete your slide you will not muscle. It wont matter if the ball is 14 or 15.
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