This has come up over on bgg and Tom Gale and Larry are looking at some tweaks to the system.
In a counter-intuitive way, mono stacking, or majority stacking unit types have an advantage in an equal resource and unit number setting. One would tend to think that a combined arms approach of 1 tanks/1 artillery/1 infantry (9 total RESOURCES-5 OSR/ 3 IRON/ 1 OIL)would have and advantage over 3 artillery(9 total resources-6 OSR and 3 iron) on the other side.
Depending on stance selection there is some variation, but even with a 1 die force advantage for bringing unit types that the enemy does not, the monostack of artillery inflicts more damage because there is more opportunity to inflict hits. 3 types of units in combined arms stack versus 1 type unit in monostack.
Several options are being looked at, such as adjusting cost of artillery, adding a drop down hit bonus(if you roll a green, and the enemy does not have green, then the hit goes to blue), and a combined arms factor that would add 3 dice for each set of units(1 inf./1 art./1 tank).
There are also some strategies to counter mono stacks/majority stacks.
Commerce raiding, seizing/ contesting territories with that units key resource. Use of air power(to cause artillery to possibly split its firepower) Most statistics run in combat simulations have not factored in air power either.
Also will take time and precious commands to organize existing units on the board into the stacks the way one wants. New units don’t arrive(and are able to be used until turn 2).
Just a snippet of what is being discussed at Nightingale games.
Larry is supposedly going to have something worked out by next week.
Hope this helps catch people up to speed.