i think i finally found a spot for the nvs. This is the ball you want when your strike ball is hooking too much,when the backends are flying but you stillhave head oil. Mine is polished and drilled pin under bridge. Itried it at 1000 dull and oob and this is finally where it seems to fit for me. I have a hercules at 4000 and when this ball is too weak the nvs is perfect. so if you arent liking yours ,( i had put mine in the basement), try polishing it and using it for the second or third ball out it might be the ticket.
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my style, the art of bowling without bowling