Hey Kray, I am also giving Union 6 a try right now to see if I want to trade up from my Dirty Weekends. They just arrived yesterday.
Have you tried corner loading these? Because right now that seems to be where they are performing best in my room, corner loaded, Audio Note-style with extreme toe in so they cross over about 2 feet in front of me.
First impression is these are loud and not very forgiving. They play noticeably louder than Dirty Weekends. Definitely more detailed than DW2, but like you mentioned there is some bite to certain instruments. That said, the sound can be very exciting and piano sounds are much more resolved on Union 6 than DW2.