As I think some others here suspected, you are exposing at rather high to very high shutter speeds, and at very high ASA ratings. In the first 2 shots, ASA is between 4500 and around 6000. This will certainly increase the noise level in any photos taken at those high ASA's. You need to select an ASA in the 100 - 800 range to keep noise to a minimum. The subjects and lens settings don't demand those types of shutter speeds, which are being driven by the high ASA and large aperture selections.