Mike,
As with any shooting problem, video helps immensely.
I would first question if your bow hand/arm movement has developed as an "on the fly" attempt to fix the left hits at release. It doesn't take long for this kind of movement to feel like it is uncontrollable when it MAY have started as a last second attempt to "fix" a shot.
Try this a few times. Hold the bow relatively loosely in the bow hand, hold your bow arm straight (elbow not locked) and consider the bow arm as just a 2X4 beam that holds the bow out there and just presses into your bow shoulder. That's all, it is just a beam. Keep the entire arm as relaxed as you can. Then, all the draw movement is on the string side of the body.
Just a idea to try. VIDEO so we can see what you are really doing.
Arne