I haven't changed anything since my original mod. I'm still very pleased with it. I wrote this for someone else but thought it answered your questions:
M1060 is an Audeze clone, I think LCD-3F. Stock form is not bad, but has a couple short coming. The mid range, 1kHz, is pushed up a little too much making vocals sound shouty, and reverb come forward unnaturally so. The treble is nicely rolled off but has to many peaks and dips, a consequence of the leather pads and internal grill structure. Changing the pads to the Audeze Velour Leather Free pads helps lower the 1kHz bump and smooths out some of the treble. Compared to stock, the clarity and resolution is greatly improved due to less internal reflections. They might seem dark to some, and they were for me. I wanted a little more sub bass and treble, so I added a 3 inch paper towel underneath the back grill on top of the existing foam. This further reduces the 1kHz bump and raises the sub bass and treble. They now have a nice downward tilting frequency response with no harsh peaks. The imaging for gaming is second to none, especially with surround sound processing such as Creative SBX. My only issues are the slight veiled sound, like it's coming from behind a layer of cloth, there is excellent clarity and definition, just the sound doesn't seem as immediate as the TH-X00 or HD650. Don't get this confused with transient response as it is still quite good. I think it has to do with the grill design they use. I haven't had any problems with my pair, although others have had wood crack, bad connectors/cables, and the strap come undone.
M1060 modded would be my vote because they provide a similar level of bass as the TH-X00 but with a more reference and open sound, no boomy sounds here. They have a slightly less forward midrange, lower treble compared to HD650, which I also prefer. The treble is smoother than the TH-X00, almost as smooth as the HD650 but also has more air or extension in the last octave compared to HD650 which is lacking in this regard.
The M1060 is also the easiest to drive, which is a huge plus. It works just fine from a smart phone or DAP. It's one other weakness is the short cable, which can be nice but usually snag mine, so I'll be getting a longer balanced cable.
Let me know if you have any more questions.