I've been struggling with double HMG's on certain maps, it gets very micro intensive as USF if the Ostheer player actually supports them.
I play only 3v3 and 4v4, now i try fast cap middle fuel point (most bigger maps have two middle fuel points) and building MG bunker with RE. Then fuel OP and sprint for Stuart. But the game for USF is on the edge. I'm enjoying the game as Axis much more now.