Every time this thread comes out, people don't realize this would hurt allies far, far more than it would hurt Axis.
Agreed. Ost spams Tiger not because it has to but it is the most effective option. Soviets outright depend in allins as their stock units are flat out bad at.
There is a link to my thread in my signature where I propose a solution to the Soviet call in meta problem without reinventing the wheel. Making Ostwind worthwhile would also make StuG E less important while buffing Ost T3's red headed stepchild so it's win-win.
Heavies need to be cost ineffective as right now they are low risk high reward. You shouldn't be limited, you should just be discouraged to get multiples. Higher popcap and a serious fuel nerf is the way forward. And then give Ace a lower but existent Fuel cost.