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I'd still go with Sarcophagidae - it just looks like one :D with the large pulvillae (pads on the feet) and checkerboard dusting on abdomen etc.

The white structures you are looking at (I think) are the calyptrae, which are present on all calyptrate flies - such as sarcophagids, muscids, tachinids and rhinophorids. The subscutellum/postscutellum is impossible to see on your photos because it is under the scutellum. Have a look at this web-page for a discussion on subscutellums :) http://tachinidae.../rhino.php