Maybe before you aligned the car, the tires were wearing a certain way, and now that the car is aligned, the tires are not making contact the same way. Do you have a before and after readout for your alignment? Here is mine that I just had done for my 1989 300ce. The printer at the shop didn't work that day so I wrote it out on a piece of paper:
http://www.peachparts.com/shopforum/showthread.php?t=124290&highlight=michelin
Here is another alignment I had done one of my other cars:
