I would calibrate them equally with your test tones. The source material you are testing just doesn't have very loud surround sounds. The surrounds are suppose to enhance the movie watching experience by placing you 'in the action'. Generally, you should not be able to destinctly pinpoint sounds comming straight from your surrounds.

I think some people like to up the surrounds/ sub a little above calibration levels but I would not increase anything above the calibrated level by more than a couple of db at most.

-David