1939 is the scenario I play. <SNIP> Along with my tank attacks on the maginot line
...
George Santayana said "Those who do not learn from history are doomed to repeat it." OK so you didn't repeat it. You did exactly what all the best military minds in the Wehrmacht knew was stupid, and you want to use that as a reason to change the artillery in the mod?
The more I play, the more I realize that the artillery strength is tightly interwoven to all the other units. If arty is weakened a lot, then air units would be out of balance (in my games I use air power mostly to take out arty stacks).
"Fixing" this is not as simple as just making arty weaker. Its a re-balancing of everything.
Here are some of my ideas around weakening arty:
Change the values to make arty much weaker, but with a big bonus for reducing defensive entrenchment. This would make arty much less capable of individual attack or defense like Civ III style cannons.
Given their power in the current game they are too cheap to build. Or place a limit on the number of arty units available at 1 time. Or create an expensive arty factory.
The real wartime limitation on use of artillery was ammunition shortages. Massive bombardments needed weeks or months to stockpile ammo. Maybe allow arty to only have support fire every other turn (or less).
Only give anti-tank arty the bonus vs armour. A 155mm howitzer shouldn't really have a bonus against a tank.
Have a commando unit that can sniper the weakest unit from a stack. That way after aerial bombardment, you can snipe the arty out of the stack. Or these units could make arty "go to sleep" for some number of turns to model interfering with supply lines. Russian, Greek, Finnish and Solvakian partisans would be interesting national units of this type.
On this scale map, heavy arty should not have range 2, they should just start with better bonuses for taking out cities and extra collateral damage. It would also be interesting to make the heavier arty actually weaker for open combat (use bigger factors to get city walls down faster).
Even with all this, its an awesome mod!!