Level 5 storyline missions - do they exist?

Yes, they exist and follow usual storyline rules - every 16(so storyline is sixteenth or seventeenth, I wonder that on my own. My research shows first case on level 4s, but i could make a mistake, heh). Rewards are quite straightforward too - standings and occasional +5 implant(not a surprise, really). Lack of mission reports on eve-survival more likely indicates that there is not too many people doing them - there is only one report, here it is.