You might want to give the ThieAudio Ghost a look ( https://www.linsoul.com/products/thieaudio-ghost ). They're technically open back, but do have some padding around the back of the driver. I think they punch above their weight from a price/performance point of view.

Superman would fly around the planet really fast in order to get it spinning again. Afterwards everyone would stand back up from where they'd fallen down, and blankly stare skyward.

I also have the K7 (there isn't a Pro), and also think it's a remarkable DAC/AMP, especially for the price.

I'm using the balanced output, and don't have any desire to swap it out with anything .... so far. :)