F500 is Fortune 500, not Forbes. Forbes Global 2000 is still impressive, especially when it's an international company that the admissions office may or maynot be aware of.
Sounds like you're well prepared for the schools that are already on your list. I'd recommend trying your luck and go for one or two that's "out of your reach." good luck!
If you feel fairly confident and prepared about the ones on your list, I would recommend adding one or two that will be a good fit but seem to have higher criteria, such as work experience, test scores, etc.