Loud isn't always better.
I think, too, that you just experienced the beneficial side of trusting room correction a little. Audyssey does some things very well, and level matching is one of them.
It's also important to keep in mind that boosting the levels artificially can deteriorate SQ. It's one thing for FR Peaks to be attenuated down, but trying to boost comes from the DSP and can more easily lead to distortions, especially if what you are trying to boost is a room effect such as a suckout.
Just curious: Do you still keep all your speakers on the front wall or have you moved your surrounds to the proper positioning for HT usage?