So, what would I recommend? You can get the Arya open box from HIFIMAN for $1300 as I think that gets you well into the best of what planar technology can deliver. The Aryas will, however, require a decent amp, and I agree with others that you need an amp anyway as I think it’ll also significantly improve what you’re hearing out of the DT1990s. I’m not familiar with your Scarlett at all, but I’d consider something like the Singxer SDA-2 amp/DAC as it’s fully balanced, offers six filters to customize the sound to your liking, has plenty of power, can be had for about $600 and uses one of the top AKM DAC chips that will provide lots of detail but help avoid harshness and glare versus some other options. If the Arya and SDA-2 are too much for your budget the Anandas are on sale for $699 and would also be great, but if you can stretch for the Aryas I think it’s very worth it. Incidentally, I’m not sure the Audeze would be the best choice for you given you’re coming from the very detailed and transparent DT1990s as you may find they skew a bit too far in the other direction of being on the softer/warmer side of things — but I could be wrong.
Sorry to drone on, but hearing a good planar headphone was a revelation for me and thought it might be for you as well given what you value and are looking for. Hope this helps at least a little, and best of luck in your search.