Solo master ops is insanely hard. I can no longer finish it. I'm 312 and combatants are 320. You should be able to level with Easy content. If I can't do it it means you need to remove the requirement. It's impossible for me I pay for the game. It's too phucking hard. I can't even complete it anymore I get one -blam!- in my master difficulty. There are many players who will not be able to handle it.
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Sorry its cliche, but that's a massive skill issue. I was getting A score at like 285 doing Master. Not sure what your build or loadout is, but its not hard. Im 315 now and in another 20 levels I'll be trying grandmaster.