Kip: I think LBR is right on with suggesting that you' re probably torquing the string. Hey, wouldn' t you know it, I' ve been through the same exact scenario. Let me tell you what helped tremendously for me; it' s some information I gained from the book " Archery Anatomy" by Ray Axford. In the past, I was gripping the string by trying to keep the string in the 1st grooves of all 3 fingers which was contributing to some of the torque. After reading Axford' s book, I started putting the string in the 1st groove of my 1st and 3rd finger while keeping the string well behind the 1st groove of my 2nd finger. Immediately this distributes the pressure on the string more evenly thereby helping to eliminate the tendency for the ring finger to cock outwards. Aside from that, always try to keep your string in line with the palm of your hand and wrist. If you have to, remind yourself to rotate the heel of your hand in closer to your face.

Here' s a couple of hangups that will cause me to shoot right as I' m a lefty too.
-Make certain you are drawing all the way to your anchor.
-Bow arm, bow arm, bow arm! If that sucker isn' t steady then I promise your arrows will go right.
-Use your back muscles all the way through the draw. I mean reeeeaaaallllly concentrate on pulling with your back!
-Plucking the string will send those arrows right too but if you pull with your back all the way through the draw then this shouldn' t be a problem.