Carrydown is a myth in today's game. With the current equipment, oil is not pushed or moved downlane it is only absorbed into the coverstocks. The only place you'll find carrydown is if you happen to be bowling right after a birthday party or something, where everyone was throwing plastic.
That being said, the same effect is achieved on the lanes as carrydown. A lot of people mistake what they are seeing as carrydown, when actually the only thing that has happened is a loss of oil in the mids. When the oil is absorbed out of the midlanes, the ball tends to lose reaction downlane, causing the illusion of carrydown.
When this happens, you can do one of two things. First, you can grab a weak, weak ball and play up the outside of the track area. Secondly, moving deeper, where you can throw a more aggressive ball that will set up early, almost to the point of a "rollout" shot is your best bet.
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Righty
High rev rate (400-450 rpm)
Semi-high speed (16-17 mph)
Book average: 202
For a game based on the principles of science and math, bowling sure does have a bad habit of being illogical.