I could 'feel' your distress as you wrote about that 'finding'. Worth getting things right as it's a major safety issue too. Seems the OEM brackets are a little underdone, but refined aftermarket one may put your mind at rest.
Had just visited this site a few days ago so it might be a resource in developing a satisfactory correction to the issue. Best of luck and keep us all apprised as to what you did. Note: You'll need to source a good welder!
Dana 30â„¢ HD Lower Control Arm Brackets (pair)