From: Southern California
Send the Shock Army to Bryansk Front, imo, and load it up with cav. The admin bonus doesn't do you any good in Rostov or Moscow, it's primary benefit is to enhance your mobile units, so look ahead towards the blizzard counteroffensive.
In the old days when it gave a morale bonus, you could get more mileage out rifle divisions attached to them, now, not so much.
For whatever it is worth, I don't think the new bonus makes a whole lot of sense; it's no longer optimal to use these armies in their historical fashion, to crack lines. They wind up being sort of ghetto tank/cav armies.
WitE Alpha Tester