I recently ordered the Truthear Hexa, so I will just be using those for now. I realized I don't use IEMs nearly as much as my headphones and It doesn't really make sense for me to spend several hundreds of dollars on top tier IEMs, so at least for now I'll be going for some cheaper IEMs.

for the most part, I actually enjoyed the XC tuning out of the box and didn't bother with tuning all that much, but I did give it a bit more sub bass with my lokius. As for how it compares, for details, I would say that the Arya is the more capable headphone. The Arya is more detailed, has taller soundstage (width is more or less the same), more accurate imaging and separation. This is not to say the LCD-XC is bad, I preferred the XC when it came to vocal heavy tracks as they provided more intimacy and a clearer center image. I also preferred their performance with heavy bass tracks. It's a guilty pleasure of mine and I love a lot of rumbly and punchy bass sometimes, my Aryas are pretty good at providing good rumble and punch, but they don't exactly give the same sensation that the XC can as it is a closed back. Overall though, I prefer the Aryas and I do think they are the better headphone.