Meh, not hard to do things below recommended light. Besides, 310 Is likely for the daughters and Oryx. You will likely be above that by killing the Warpriest and Golgoroth, assuming they drop a piece of armor (these should be 310 - 320 light).
Yeah, I figure that, it's just supremely frustrating the way the current raid drop system works. I invest the time to clear on multiple characters each week, I should be rewarded for doing so. HM looks to fix that a bit with the guaranteed Oryx drop though.