On the long review posted a few pages back, I saw the guy say that the soundstage being wider was the most noticeable difference between the modi and the modi2uber. Funny he says that because thats the first thing I have also noticed when comparing the Gungnir and modi. That makes me wonder how much closer to the gungnir the sound of the modi2uber is :D
I may be in the minority here but I prefer the bumps vs no bumps. I am saying this based on a comparison between my k240s and Q701. The K240 becomes itchy after a while under the headband matbe due to heat. The Q701 bumps help in getting some air in there.
The rattling sound went away with my Q701 after some burn in. The amp may also be better on one channel vs the other making it rattle more on one side. Is your test with a test tome with the same exact volume on the left and right?