My Kharkov defense needs a lot of troops cause I do so much counterattacking every turn so I need troops to fight with the tanks and more for the hogs.
Problem I see with that defense, is that as the Soviet player, I would simply stop attacking Kharkov, and use my available air strikes (and possibly interdiction) elsewhere. If I notice the german player is in the mood for an aggressive Kharkov defence, then I will play more cautious and take baby steps towards my objectives. If I notice the german player having a passive defence, I will be considerably more aggressive, all in the hopes of making him aggressive. Why? Because it's a lot easier to defend the territory east of Kharkov then around Krasno! I'd rather fight the panzers any day around Kharkov then around Krasno, which would be defended by weak cavalry among others.