Since the last patch, some mid-game units became unpopular. (T70, SU-76, Flamer HT).
Why not decrease the fuel of T3-T4 russian buildings? so that, after it's built you can have access to mid-game vehicles such as T70/M5/Su-76 and... if you wan't to get a T34 or SU-85/Katiuska, you will have to research an upgrade from that building that will cost more fuel.
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+1
Here you have it Relic, you dont even have to invest in any thoughts (money) on this. Just copy and paste. Money saved and you get a better game.