How much time did you spend with it? Correcting a wild frequency response can be jarring in how different it sounds. But acclimating to it, then switching it off, will reveal how bad it sounded before.
Instead of using L/R bypass you may want to just mess with the target curve a bit, trying to add back some of that missing bass.
On the fronts I've been experimenting quite a bit with this.
I've tried to set different upper limits on the curtain in Dirac and found something around 300-350Hz to give the best result. If I let Dirac adjust the frequency response up to 10kHz or something like that, I get the worse result. Then the sound becomes very dead, dull and lack dynamics.
I've tried to correct the frequency response up to 1kHz, but even then there is a lack of passion in the sound. Even at 600Hz I feel some degration of the sound. Going below 300Hz though I start getting unevenness in the bass, and letting Dirac correct it gives a better sound.
The frequency response from my speakers is reasonably flat already uncorrected, except perhaps for a +2 or 3db lift around 2-4kHz and a -1 or 2db dip around 1kHz. To even it out more, I've added a few manual PEQs.
At first I tried to set those PEQs using REW, but I didn't get it to my liking. Eventually I figured out that using a single measurement point wasn't giving me a proper picture and I was overcompensating for local issues.
Instead I tried to just eyeball out a few manual PEQs using the averaged measurement curves in Dirac - and that gave me an excellent end result.
Still, my general conclusion is that the higher upper frequency you set on the automatic room correction (Dirac or Audyssey) the more you lose the fun, joy and passion in the sound. Even, or perhaps even more so, when the uncorrected frequency response is a fairly flat one to begin with.
