Hey frock,
I don't know if the Slash is a whole lot more than the AU79. Mine wasn't but I did drill it a little mellow. I really like my Arsenal Aggressive drilled mellow under my GP2, surface alone on that ball gives me plenty of strength. Hope this helps...
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Rick Leong
Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff