For the field, your GMAT is a little below the market quote. That said, it isn't out of any school's 80% range and your community service sounds interesting relative to many (play that up) so I wouldn't rule anything out simply because you don't have a 750 GMAT. That said, you might want to resit the GMAT simply to get a 7-handle on it that matters to many of the Strategy houses.
LBS and Kellogg are a stretch whatever the weather, simply on background. Said I would look into to check it has a presence in what you want - it really seems to me that Internationals seem to value the Oxbridge MBA "brand" way more than UK and possibly European types.
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