Cam, it seems the autosetup sets the bass levels much too low for most of our tastes. I had to bump my 3808 up 5db to achieve a satisfactory level. You should bring out the SPL meter and try setting up the subwoofer levels using it or just use your ear to get a setting that you like. The LFE setting means you will not be using the sub for music, only for the LFE channel during movies so I would suggest using the LFE + Mains setting, it is early for me so I might be to quote a certain baseball player "mis-remembering".

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70