Here are Tim’s thoughts:

• As the German, I’m not sure it if is better to do overruns before combat or afterwards.  More than once, I had a stack stopped and left out of position for the combat phase when it received an adverse result on the CRT.  Maybe overruns are best used to disrupt a key soviet unit (most likely a headquarters unit).  I tried that once and it seemed to work well.
• I forgot that ZOC’s don’t extend across the Don (even though you reminded me…probably the beer had an impact…).  That explains why I put so much time and effort into that area.  I was trying to extricate a couple of motorized divisions that had gotten ZOC’d up and that I wanted to use elsewhere.  Just like Hougomont at Waterloo, a subsidiary battle took on a life of its own.
• I belatedly realized that I’d captured Voronezh on turn 2.  There are three hexes of Voronezh and I thought you had to capture all of them to get the VPs for the city…I only needed the two I had captured right away.
• The Hitler directives do play a role.  I lost a motorized division when I had too many motorized/panzer units in the north and I was reluctant to move units across the Don as I was afraid that a bad die roll would result in them being taken away and sent somewhere else.
• I enjoyed playing the game and I definitely want to try it again.