I think you are making Block Houses too strong; all infantry defend @ 4? That’s too high. It should be a 3.
Also, if you use the HBG Marines and attack with a flamethrower unit, that should negate the block house advantage.
Well, if we have a Cold War game, then how about after the USA and USSR nuke everything we have a new game of “Rise of the Machines”, humanity struggles to survive against the Terminators.