We did it last night second run with a 304 and he wasn't the one who caused the wipe. ( it was a more skilled in your eyes 319 who didn't get out with unstable light) Did you put him at gaze 2 and leave him outside the pit? This should be what an experienced or "skilled" as you put it raid leader should do to negate the low light level.
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Also maybe you could explain how, without racing or Iron Banner, he was going to get to 315 without doing hard mode? The absolute max you can get from normal alone is 310. Maybe you might be an elitist.