Im sorry, Im not a lefty, but I think a righty can help just as much as another lefty. Most oil balls dont have alotta 'pop' on the backend, it also depends on what kind of bowler you are. Your profile doesnt provide much information on you, which doesnt help us, the BR members, to help you out. And if a ball is leaving corner pins try stepping forward or backward on the approach a few inches, usually helps, if that doesnt help, the ball isnt saving up enough energy and the oil you think is heavy may not be as heavy as you think.
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16 years and still going strong! 16 years old that is!
The names Warrior Princess, Xena..Warrior Princess
And why would I "saw" pins in half, THATS A WASTE OF PINS!