Help with MPEG StreamClip

Ok. So I was compressing my .264 mov files with MPEG streamclip in order to edit them on FCP. One of my files compressed fine, but it wasnt an HDSLR file. It was a 720x480 movie file that went from 192.1MB to 2.09GB. When I try to compress my HD DSLR files it goes from 14.7MB to 72MB. I am converting these files to Pro Res 422. Any idea why they are getting larger?
 
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