I agree, it is the same when you try to take the bunkers in Hellfire Pass in the T41 Battleaxe alt scenario, when i was the CW player it seemed there was no hope of taking them, but when i was the Axis i could see the effects of the CW player chipping away at my units fatigue.
However if the hex has a reasonable value supply source and you are short on turns then it might be worth bypassing if that is an option?
I just looked at the scenario and i am guessing it is the 300vp hex you are trying to take, as it is not a supply source if you can isolate it then any German A units will be straight down to C, try to mass all your Stuart and AT units into one stack to give you a maximum hard attack option and turn every 155 arty unit on it and see if you can cause any casualties that way?
But i agree, very tough cookie.