OK, these were my results after I calibrated my Harman-Kardon AVR65 receiver using the Radio Shack digital SPL Meter at 75dB.
L=0dB
C=0dB
R=-3dB
RS=+5dB
LS=+4dB

if sound is usually twice as powerful at 3dB...would it be better to just set the surround speakers both at +3dB, instead of where it is now, or would that be ruining the general purpose of calibrating a home-theater at 75dB?
Or would it be better to round off the L rear at +3dB, the R Rear at +6dB, and the Right speaker at -3dB?..since 5 is closest to 6, and 4 is closest to 3?