If you're looking for supply chain / operations, you're looking at the wrong schools, as the schools you listed as a group essentially tend to attract folks who are interested in finance careers (although Wharton does have a strong operations/SCM faculty).
In short, here's what I suggest:
Retake the GMAT only if you have the time and willingness to do so. I know that prepping for the GMAT is a real pain in the ass (few things are more tedious than studying for that exam), but you have some time - so you can spend the next 2 months prepping for a retake. Your 700 is okay for the top 16 schools, but for safety you ideally want a 720+.
From there, if you haven't already, visit a few schools while classes are in session (basically, until the end of April). This isn't about trying to get the attention of the adcom, but more for your own knowledge. Visiting campus and talking to students one-on-one will give you way more insight into what b-school is like than any website or second hand information. You don't have to visit all the schools you're applying to; in fact, you can even visit schools that you may not plan on applying to (i.e. if you're going to visit Columbia, you might as well visit Stern since they're both in NYC).
In terms of target schools:
Stretch (choose 2-3): Kellogg (look into their MMM program), Sloan, Tuck, Haas, Wharton, Columbia
Sweet spot (choose 2-3): Ross, Duke, Darden, Cornell, Yale, Stern, UCLA
Safety (choose 1-2): Tepper, Georgetown, Texas, USC, UNC, Emory, Maryland, Purdue, Indiana
If you spread your schools across these tiers, you'll be good to go.