@Imperious:
It makes no sence whatsoever to have a technology the better coordinates Artillery fire for Infantry at double the efficiency, unless we are talking modern warfare with guided missile/projectile technology. Its really like they made this Technology out of thin air with no correspondence to the actual war. It would be a much better thing to allow tanks a boost with planes present in battle and acknowledge that battlefield doctrine of warfare, than to assign this bogus mystery technology that didn’t exist.
Twice the effectinvess does seem quite a bit, but then if you compare American artillery and German artillery - it could be said to be twice as effective. Forgetting that US artillery was mobilsed and German guns were mostly horse drawn, the US introduced forward observers - better co-ordinating their batteries to front-line units. Guns could respond to fire missions much quicker than German batteries, and generally the US were pretty much using a modern system of combining guns and infantry - look at the number of germans killed by artillery compared to other means in the Bulge and you get an idea of just how advanced the US was at this system. The calibre of the guns was not strictly relevant, what matters is rate of fire, accuracy and speed of response - how much weight of fire you can dump on an area in a five minute interval is key.
The Soviets also took a similar approach, and by the end of WW2, almost half the Red army combat strength was artillery - one could argue that the MRLS system they had constitutues that combined fire-power. Certainly the Germans couldn’t match that level of fire power. Now, whether in the Russian case this is better represented by simply buying more guns or adding a new tech to represent doctrine changes is a debate.
But I did see sense in the technoglogy itself, and I recommend an article in the ‘Bitter Woods’ rule book which compares German and American artillery fire control systems.
But then this is Axis and Allies, so in a way it doesn’t have to be so tied to history - you have to invest in technology boosts, so it could represent all that funky stuff the Germans were developign such as SAMs and guided anti-ship missiles.
That said - your idea of boosting tanks and planes is a better way forward, and more in the character of Axis and Allies.