For A&A 1940 and other variants we’ve been playing over the year, something interesting my group has tried is reducing the IPC costs of purchasable units to add more combat and variety to the games. It’s roughly based on taking 2/3 the price of the regular costs.
IPCs
1 Chinese infantry
2 infantry, Chinese artillery
3 artillery, mechanized infantry, AA gun
4 tank, submarine, micro industrial complex
5 transport
6 destroyer, Chinese fighter
7 fighter
8 tactical bomber, cruiser
9 strategic bomber, minor industrial complex
10 air base, naval base
12 aircraft carrier
15 battleship
20 major industrial complex
You’ll notice a couple odd things like why China gets cheaper units and the existence of micro (build 1) factories because we tend to combine a bunch of house rules. There are also many minor changes we use for the units themselves and setups, NOs, and other game elements to keep standards like G40 from getting totally destroyed by this sudden influx of units (since everything is cheaper). But it’s been a really fun, simple change.
Have you ever tried any major IPC adjustment with success?