Is it driving much better now because they reflashed those modules? Especially the PCM to newer OEM parameters not the Diablosport tuned parameters?
What do you think caused your issues?
The Hemifever tune?
Faulty OEM knock sensors?
Faulty OEM PCM or it's code?
Have you tried loading a tune and running with your tranny in "6" instead of "D" to disable the MDS while still allowing the knock sensors to do what they were designed to do?
It is driving better now than it was when I was stock originally (before I ever loaded a tune in the first place). Shifting is in general smoother (up and down shifting), and it firmed up my 2-3 shift which would have a slight delay previously. This is the TSB which was applied: http://www.wk2jeeps.com/tsb/tsb_wk2_1802713.pdf
I also had the ABS module updated and this DTCM TSB applied: http://www.wk2jeeps.com/tsb/tsb_wk2_2100313.pdf
My OEM knock sensors were/are fine, even though I replaced the passenger side sensor. The OEM PCM was fine as well as the Jeep had no driveability issues prior to ever installing a tune. It didn't matter what tune I loaded (Hemifever, Diablosport, or even modify stock tune), as long as MDS was turned off via the tuner the PCM was not picking up any readings from the knock sensors. Also, I am 100% sure that MDS still engaged. Driveability was not affected except for the P0330 code that would pop when I would get aggressive with the throttle (i.e. passing on a two-lane highway, merging onto the interstate), but it never missed a beat or hesitated. That code is related to the passenger side knock sensor circuit, but all of the wiring checked out. My guess is that the PCM never retarded timing because it never sensed knock. I developed an intermittent light tapping which followed engine RPM, which progressively worsened and became more consistent to a point that I stopped driving it and subsequently had it towed to the dealer.
And yes, once I determined that the knock sensors weren't operating properly when I had a tune loaded with MDS off, I went back to stock and would just use "6" to keep MDS off. I have not loaded a tune again since I got the Jeep back - but I am planning to load one this weekend with MDS off and log it idling sitting in my garage to see if I get a reading from the knock sensors. If I do, my guess is the old revision of the PCM (68170423AB) has an issue with trying to load tunes with MDS disabled.
The very first time I got the P0330 I wish I would have dug farther as to why I was getting it. I drove it for probably a month on the Hemifever tune with MDS off (which means that the PCM never sensed knock during that time) but it was driving great and I didn't get any other CEL's. However I could have had any tune loaded with MDS and had the same results - the problem wasn't localized to just Sean's tunes. Even when I developed the light tapping that turned horrid it never threw a CEL. Once the dealer got it they said there was a misfire on cylinder #5 and #7 which they diagnosed down to a broken rocker shaft, the other rocker shaft being cracked, and damage to the cylinder head that was bad enough to require replacement.