Just a thought, but if your car is still sagging in the rear and your control arms are in good shape.....? I would recommend checking the springs and/or the shocks.

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1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

"Excuses are crutches for the unfounded."