There has got to but something else though, as many users have much better results. I don't know if it is something specific about your room acoustics, speaker characteristics, or something else but the way you described the overall results just seem out of the ordinary.
Take a look of many REW graphs posted by Audioholics and you will see a good variety of results others were able to achieve. None perfect for sure, but much better than the "uncorrected" response in their rooms/setups.
If you haven't given up, I would love to take a look of your Ady file and see what I can do with the freeware Ratbuddyssy. To do that I would need REW files for your measured response, for at least the MMP.
The Audyssey MultEQ Editor app users thread (with facts and tips) | Audioholics Home Theater Forums
As HD pointed out, you can follow OCA's system and get post calibration tweaked results, or follow mine, that will be much more time consuming, but can expect near flat response for the range 20-130 Hz or to 200 Hz, and then you can easily put a bass tilt to simulate the popular so called Harman curve. As to the harsh sound effects you seem to be complaining, why not just set the corrected range to say 500 Hz, then Audyssey will leave it alone for you.
OCA's popular system to tweak Audyssey results with REW and his script:
The Audyssey MultEQ Editor app users thread (with facts and tips) | Page 27 | Audioholics Home Theater Forums
My own simple in theory, but time consuming to do system:
The Audyssey MultEQ Editor app users thread (with facts and tips) | Audioholics Home Theater Forums
People do get very different results, that would range from really bad to really good; and I believe while there are many reasons including in some cased the users might have misunderstood the instructions, and/or how those RC work. That said, if one is willing to spend time on it, one can invariably getting better results than not using room correction.
You obviously have spent enough time on this and know a lot about it already, so I hope you will not give up making it work for you.
By the way, you said "so I only used one listening position, testing it 5 times for overall accuracy. " Did you mean leaving the mic in that same one position for all 5 measurements in that one calibration? If so, I would suggest you do it again, and this time follow the
exact instructions for the mic positions as stated in Audyssey, and/or Denon/Marantz owner's manuals.