If you did the calibration process correctly, with the test tones the surrounds should be at the same level as the mains at the listening position. With actual program material, if you're using multi-channel stereo mode the levels in the mains and surrounds should again be identical because all that mode does is to duplicate the mains material in the surrounds.

It can be suggested that for CDs and other stereo material multi-channel stereo not be used. For better putting the surrounds to work with stereo material use instead a mode such as DPLII or Neo:6. Instead of merely duplicating the mains in the surrounds these modes extract the natural surround ambience mixed into the main channels(there was no place else to put it)and send it to the surrounds where it belongs. This material is slightly delayed in time, slightly rolled off in the treble and slightly lower in volume as compared with the sound played in the mains.

The first point though, is to check that the level calibration step was done correctly.

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Enjoy the music, not the equipment.