If you hadn't cleaned your Crown Jewel, you can take it into the pro shop. Usually they're able to determine your Positive Axis Point (PAP) from the track on the ball. The PAP differs from bowler to bowler. I'm not sure whether the fact that you bowl with a conventional grip would make a big difference. With a discussion with a decent pro shop operator, he can determine what would possibly work for you.
This article will give you an idea of what they look for. ebonite.com/resources/bowling_tip_detail/the_positive_axis_point
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