Am I supposed to calibrate the mains to 75dB and the subs to 85dB to take into account the +10dB on the LFE for DVD's?

Avia has the sub channel at 75dB so when you calibrate using it, when the LFE on a DVD is +10dB it's already calibrated at 85dB.

My subs don't sound right - I've got them equalized and calibrated at 82dB when the mains are at 75dB...