If I understand, your ball is sliding 2/3 down the lane on oil. Once it hits dry boards, it rolls into the pins. - Am I right?
That usually comes from your release. If you release the ball from on top with palm turned away from the pins, it will basically slide downlane on the oil until it has to roll.
I don't know if you can find a ball with better fit (a personally drilled ball makes a huge difference), you can hold the ball more comfortably wtih the palm behind the ball. That way, you can keep the palm flat and facing the pins throughout the swing without having to turn the wrist. It give more momentum to the ball, resulting in more pinfall.
When you are ready , the first investment is in a bowling ball drilled to fit your hand.
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