I have played the stock CG 6 times. I think with all those pro axis changes you make I would not take on a game a Russian. In my experince simply giving the Germans QFM is ample to re dress any imbalance.
In the games I have won as German I conducted an aggressive defence and was successful in ending the game early. I agree that a long game will favour the Russians. But the Russians may not survive to long with all your beefing up of the Germans.
As for the SS variant, well I fail to see how any good German player could lose it. Add QFM and I would back the Germans all the time.
So much of the big campaigns depend on player skill. Even a small edge in skill over a long game will result in a victory for the better player unless there is a huge imbalance (ala 'Welcome to the Fascists'). Thus getting the balance right is very difficult. I applaude your efforts but I think you go a bit too far.
I am playing Rhzev 42 at the moment and dislodging Germans from 40% trenches in 30% terrain (total 70%) is very very tough. So much so that Germans in such positions are virtually immune to any type of Artillery fire. I don't even bother shooting Arty at them anymore, best to just work around the flanks.
Just my 2 cents.