The ouput size has nothing to do with size of the orginal but with the settings you put as min/max/avg bitrate for the video (or value of the CQ if you encoded in CQ or CQ_VBR mode).
If you changed nothing to the template, I think you did the job with CQ=70 qs it's the default. This value is too big for the source you have.
Eache source need a different CQ in order to obtain the target size wanted. You must do a "file size prediction" manually or with a tool like CQMATIC (see the corresponding section on this forum).
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