It's quite simple.
If you're confident you can boost the quant score without much effort, then you can retake the GMAT *and* still make it in time for R1 -- you'll have time to work on the essays as well as GMAT prep if again the 72% quant was simply a "bad hair day" for you. In the end, it's not going to make a huge difference, but it can help.
In all, you're targeting the right range of schools, so it's just a matter of deciding whether you are willing to retake the GMAT or not for noticeable (but not essential) benefit.
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