Weird alignment problem PLEASE HELP!

I have a ’95 E320 wagon with 80k miles. After several alignments it continues to wear-out the outside edges of the front tires. Is this common? Both the front and rear shocks have been replaced as well as the front and rear sway-bar bushings and rear links. I usually run the front tires about 30-31psi cold, the rears about 38psi

The front tires look great except the outside edges. What gives? Any ideas? Is this normal? The rest of the suspension seems OK.

Thanks in advance,

Jeff