Getting my FF/Energy Defender from 40 to 50 was very rough. Took me about a month or so of constant teaming farming missions (this was way before AE farming was a thing). Still; I'd buff the tanker and the nukers. The Tanker will start corralling the entire map at the same time the nukers go dumpster diving. Then the tanker dives in with the entire map following him; into nuclear hellfire.
Then we quit the mission and reset it to do it all over again.