The problem I have at the moment, is not having enough Army HQs. And I can put 9 divisions with average 2.5CV under one HQ (22CV total) or just tank 4 corps (12CV total). I had to stop building new tank corps in order to make new Army HQs. When I will have enough of them, I will be back to making tank corps (that plan will probably fail, due to the need of rebuilding divisions destroyed in German summer offensive by then). I'm also waiting for the Tank Army HQs to be available, though their low command capacity (15) makes me worry. I think I will try to put 4 corps in each, with 1CP overload the tests will be about 9% harder for the commanders, which is not so much taking into account that there are several good tank leaders available.
The CP tradeoff of 3 rifle divisions (6CP) to 1 rifle corps (4CP) is good, reduces the command strain. But with mech units it's not good (3CP for 3 brigades, 4CP for the corps). How do you organize your armies by then? Just 6 Tank Armies give place for 18-24 tank/mech corps. So the rest must be assigned to regular armies. Is it better to make several tank/mech only armies or just give 1 to each infantry army, like I did with the cav corps?