Suggestions.PART I
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This is the only likely change you will get:
What Barton said.
I would only add that USF will have access to 3 indirect fire units when the M8 Scott stops sucking. There needs to be some differentiation so that we don't have cheaper units (mortars) overshadowing units that require specific tech paths (pak howitzer).
I would only maybe consider buffing barrage range. However only if officers don't come for free, and still maybe.
The USF mortar is supposed to be an early-game unit. USF problems are late-game, and USF is a problem early game. Buffing an early-game unit won't make either problem go away.
USF is outperforming Soviets by 75% currently (28% USF versus 16% Soviets against OST). It still needs to be brought in line so taking away the USF free squads would be a logical next step.