I don't have any advice, but I have read that when using bass management on a SACD player, the player may reduce the analog sub (SW) level by typicaly 5 dB, maybe 10 dB depending on the player.
This is so the summation of bass (The standard .1 LFE track and the redirected bass from all the other channels) doesn't overdrive the input on your receiver.
Some receivers let you apply sub level changes per listening mode, which may let you provide correction for this in your preferred SACD listening mode, and then not for movies in your Dolby or DTS modes.
