I will edit this post with further updates.
27 hours of burning in.
They are definitely sounding better. The bass is getting there and the soundstage is much better. They tend to sound a lot better when I press the earpads against my head, since better isolation. Too bad they can't have that kind of isolation all the time.
Almost 50 hours
They don't sound any different to last update. I don't really like the sound since the mids and highs just sound awful compared to my Grado phones and the bass is still not much better than my Grado phones unless I press the ear cups against my head, which actually fixes all the problems more or less. If they don't get to sound any better maybe I'll consider modding them to sit a little tighter on my head, but if that isn't possible it is going to be sold.
Roughly 55 hours
I think my ears are starting to adapt to the sound. There are still some tracks that sound a bit weird in the 250-1000kHz range with these cans, but I guess it's the production quality (or lack here of) of that I'm hearing. Generally, I like them better now, but I will definitely mod them with velour cushins instead of this fake leather they currently have. Both for the comfort, but also the sound. I will look further into cable modding, but currently I don't know enough to draw any conclusions on that point. Maybe, if someone reads this thread, he/she can help me out understanding what it's all about? PM is always appreciated.
I have also noticed that the sound is very depended on how the cans are placed on my head. Even milimeters can make the difference. I can notice a significant change in sound just by turning my head. I'm hoping an ear pad mod can change that, but it's a minor issue if any at all.