Another thought. Many receivers have a 10dB boost for LFE. It's a little annoying because the settings can be "0dB or -10dB" like in Marantz, or "+10dB or 0dB" for my Denon. Basically you want to use the "which ever is greater by 10dB" setting. Looking at the R772 manual, you want to select 0dB for your LFE Level Setup (page on the manual)
To sum up
1) Set your speakers to small or *not* full range (whatever R772 calls it)
2) Set you LFE to 0dB for Dolby and DTS.
3) Set your speaker crossover at 80hz,
4) Turn off "night mode" and/or DRC - Dolby Range Compression
Finally, you can try running through the autosetup to see what it does. It maybe worth a shot to see if your baseline config is good to go or not.
