they should be making them out of heavier wall tubing!
Go for the Pete-Z setup, it works with the stock LCA, which can be boxed.
I can build you Lower control arms that wont break, out of heavier 4130 tubing, and mount the tabs closer to the front of the control arm, so the leverage working to break them is reduced.
contact me through
www.Landysperformance.com
Brian