I'm pretty sure you'll get even sharper images if you shut the lens down a stop or even two. Lenses don't perform at their best when wide open. Let the shutter speed work itself out, but I guess you probably need 1/500th or better. Fully manual exposure will be a pain, so I'd avoid that. Maybe think of using the auto-bracketing function if exposure is proving difficult?
Please note these comments are based upon hearsay and book learning and unsullied by experience from the real world. Nice pics by the way.