Unless your Yamaha rx2700 can perform bass management on multi channel analog channels (which I doubt very much as this is typically a feature of separate processors or very expensive receivers), you will need to configure the bass management in your oppo players.
As for speaker distances, I think it depends if you use some sort of "pure direct" mode, in which case, I think you also need to set the speaker distances (I know my older Onkyo was making this distinction between "multi-channel" (no bass management, but time-delay) and "pure audio" (no bass management, no time-delay).
If your Denon can send DVD Audio on HDMI, why isn't it capable of doing the same for SACD? My Oppo play does both. My Sony players only support analog. Or is it possible you were only listening to the alternative DD/DTS tracks typically also found on DVD Audios?
