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Apparently what happens here is the shrinking effect by the drying canvas. We cannot proceed on by just adding new fixtures to straighten it. Doing that will create more stress on the fabric when paints are being plied onto it, and more shrinking with the paint drying on its surface.
I second Alex's wise advice to remove the canvas completely. In fact, this advice is useful in any situation where you experience bending/warping of stretchers.
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