I really think you should use a "light touch" when balancing. Making the sandstorms weaker to infantry was an appropriate change, however raising their cost by 30% was drastic and has the effect that I can't get them deployed in time to make a difference. Whats the point of having "epic" units if they're going to be nerfed into Oblivion?
Also, this isn't a balancing suggestion, but I'd enjoy an all out war mode, meaning fight till the enemy base is destroyed but with no nuke to control. As it is now the game caters to only one basic strategy which is quickly flip nuke control near the end of the meter.