Burn in of wire is real, alive and well, believe or not.
There are times that I try a fresh set of cables that appears a bit bright, harsh, grainy, and a bit hard to listen to. An A/B comparison with a burned in set can sound noticeably different. So I let the fresh set burn in for about a week and compare them again. This time the cable has smooth out. Gone is the graininess, gone is the harsh edge, and gone is the brightness. I compare them again and now they sound the same.
If I would have went with my initial impressions I wouldn't have liked them.
If you like these from the get go that's great, but they will change with some time on them. It looks like a good opportunity for you to see if your impressions of them change or if you notice a change.