@couger4u I’ll give you a different perspective…
Speaker placement is what affects the shift to one side. Even though your image may be centered, you could hear more information from the left or from the right. Room layout can cause that too if you have an opening on one side of the room.
Now…speaker cables, especially an upgrade that’s as drastic as stepping up to Valhalla 2, usually results in a significant sonic difference.
Sometime the difference is large enough to require changes to speaker placement. What may have happened in your case, adding a cable as detailed as valhalla 2 resolved the less than optimal (for your previous cable) speaker placement. Now the details are pouring out of the speakers and it seems more even.
That’s my take on it.