I have had success straightening/bending dry limbs by wetting the area, wrapping in aluminium foil, taping the ends with masking tape, heating with a gun and applying weight. The water steams up inside the foil and prevents scorching. Bend a little farther than needed as it will return some. Allow to cool with weight applied. A light scrape or sand will remove the tannin stain the water leaves on the surface. I used this technique on a number of Ironbark bows that all decided to do their own thing.