odds are the reason the drop bracket kept breaking is because when you lenghthen the distance from the point of attachment to the point of resistance(the cylinder to bracket joint) you inherently add more stress on the bracket and frame due to leverage. That is why the idea of welding the drop bracket to the frame is a good one. By doing that you effectively spread the load the cylinder over a larger area of the frame than just where the bolts are attaching it. The issue of the frame ripping out with the orig bracket is probably a matter of the frame being fatigued from the drop bracket problems. With all this being said, I would put on a new drop bracket, weld the perimeter of it's base to the frame all the way around, and then add a gusset from the furthest point of the drop bracket from the frame back to the frame . This will triangulate the bracket and greatly reduce the stress on the bracket dropleg, the frame rail, and also reduce the unwanted flexing and movement of the bracket assy. Any time you turn your wheels with the car not rolling the pressure of the cylinder pushing against the bracket is greatly multiplied due to the friction of the tires against the pavement.
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