Well that IR score is a bummer... but the 740 and the rest is really great. I wouldn't worry about a re-take if I were you. While IR may become more relevant, it's still in process of determining how much impact it will have and you could keep in mind... schools don't publish their average IR scores (at least yet). But I'm sure they'd like what a 740 does to their average (if they like the rest of your profile too). ;)