"Adding more power" doesn't bring out detail; it's meaningless unless it's actually used to make the sound louder, which again, shouldn't be needed in your setup. The 3808/M60 combo should provide the possibility of a horrendously loud sound level already, without more being needed.
This doesn't change the volume, but I'd suggest that you run all your speakers "Small" with the 80Hz crossover and the sub mode LFE only, not "+ Main". Running all your speakers full range, as you're now doing, doesn't let the sub take part of the low bass burden off of the speakers and 3808.
