It is probably your room or speaker placement.
My Wilson speakers always seemed a tiny bit louder from the left channel. No one complained, but I could hear it. If I positioned my self slightly right in the chair it largely went away. I have always assumed the seven foot proximity to a wall on the left and open to the right was the issue.
The speakers are eight feet apart and four feet out from the wall behind. That wall is all glass ten feet tall. I have some four by two foot absorption panels I place around for effect. I decided to try them vertically against the doors between the speakers making a four foot square. What a difference! My channels instantly centered and the center filled in perfectly. I lessened the toe in a bit and the sound is super wide now. So, lesson learned. Except my view outside is now lousy but only during serious listening sessions.
I also had Valhalla 2 for some time and found it much better than the lessor Nordost. Really pretty too. Switched more recently to Wireworld Platinum Eclipse for more body in the sound. Better for me… Nordost is first about exciting detail vs music.