As mentioned a lot of times before, let your ears/brains get used to the sound.
Planar sound is definitely a bit different and in fact, headphones like these (warm + neutral-ish) might take a bit of time to get used to them and might sound underwhelming at first!
After that, if you still find them not up your taste, then you'll know what to do! ;-)
Or maybe you are just a basshead...
Yeah. Problem is I don't know a closed headphone upgrade from the DT770/80. I was thinking of sending them in to headphile for the darth beyer mod.