You test scores look to be the weakest part of your app, but only because the rest of your app is strong. At Dartmouth last year the median CR & M scores for those admitted were 740 & 760. (http://www.dartmouth.edu/~oir/pdfs/admissions_10.pdf
see page 3) Dartmouth had a 15% increase in apps this year and after the ED admits, estimates are they will only be admitting about 8-9% of the RD applicants. Your chances are probably above that, maybe 15-20%.
I don't know the other schools as well, but chances at Brown would probably be similar to Dartmouth and less at Harvard. Cornell didn't see any increase in apps this year and your chances would be better there, but may depend upon which program you are applying to. Cornell has some has some pretty good admission data online that should give you a better idea. I don't know enough about Bowdoin to offer an opinion.