Buck,
The "general" thought is that going down in weight will make you throw it harder, so people think that doing so is a good idea for dry lane equipment. Sure, you may throw it harder than your 15lb stuff, but you will also lift it harder as well.
I would stick to one weight bud.
-EX-
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C-G Pro Shop (owner/operator)
Youngstown Ohio
Track Intl.-Amateur/Pro Shop Staff