After about 20 hours of burn, things have not changed much. I did a little a/b with the 4in1 this evening. These 2 headphones couldn't be more different.
The DT2+ has less sparkle than the 4in1 and MUCH more warmth. On the plus side it makes the DT2+ less fatiguing to listen to. However, on the down side, this extra warmth along with the abundance of midrange might be what's lending to the perception of a narrower sound stage and a sensation the sound is congested.
I've tip rolled 4 different types of tips with no real noticeable difference.
Other quick notes:
* the nozzle is very wide in diameter. This makes it difficult to get some types of tips stretched onto them. The Trinity hybrid tips end up slipping off and staying in my ear 50% of the time.
* there's a LOT of driver flex going on when working them into your ear for a seal. The drivers release quickly and I don't hear any distortion. But, it's been a long time since I've heard this much driver flex.
I'm going to keep burning them in the hopes that they eventually open up and reveal more detail. Until then though, if you can deal with the piercing highs of the 4in1, I would go with that. The clarity, separation, and bass of the 4in1 make for a higher quality sound overall.