From: Chicago, Illinois
That's exactly why I don't like committing much to AGC early. The Panzers will stall at the Dnepr line, and air drops aren't enough to make up the difference. The problem is that the supply trace up there is through all those Light Woods, which really slows it down. You can't make a ton of progress until 4th and 9th Armies catch-up, and the railhead is closer to the front.
I personally like what JAM did to me: Commit an extra Panzer Corps from Pz Gp 3 in AGN, and shift them south after breaking the Luga line in turn 7 or 8. By then, you should have a railhead close to the Luga, and you can rail those guys to Vitebsk. By then, AGC is in much better shape from a fuel supply standpoint and can make hay.
The extra Panzer Corps from Pz Gp 2 can make the drive on Moscow, after crossing the Dnepr south of the Pripet.
I just think AGN and AGS have the best supply situations early, take advantage of that