Matt,
Reading all the above suggestions, I think I lean towards CoachJim's approach. Also I'd add that it's possible that a more "rolly" ball will help you play in the area that your other lefties play, but the ball will be slightly stronger to make up for your more spinner-like release. Polished solid resins with very small flare like a polished Columbia Hyde, AMF Titan SE, Track Heat (pearl but fairly rolly), Ebonite Black Ice, Storm Hot Tod Hybrid are the type of balls I mean.
Also placing the pin further towards your track will raise your track slightly, like over your middle finger. Very close to your track (outside your middle finger) will reduce the flare a LOT and raise your track considerably. This allows you to use a stronger ball and still get a decent reaction.
Still it's better to stay behind the ball more; not turning the ball early helps raise the track also. Many low trackers start turning the ball with their wrist/fingers, well before their thumb escapes.
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"...for advice is a dangerous gift, even from the wise to the wise...."
J. R. R. Tolkien