I have no idea what just happened. If its the speakers opening up or the dac finally warming up, or both but what I am hearing now is off the charts. That was the biggest change I have ever heard in any of my set-ups. Night and day difference.Perfectly normal. Happens all the time. Congratulations, hearing this shows you're actually listening. Every component goes through rather dramatic changes, especially during the first few hours its burning/settling in. And yes twisting and bending wires does indeed disturb performance. Sometimes a lot.
My system goes through a rather dramatic warmup every night. I don't even want to hear it when it first comes on. Usually play some demagnetizing tracks and have dinner or sometimes tweak interweb snowflakes while it warms up. Even then the first side sounds blah. Huge improvement just from the beginning to the end of the first side. Even then it continues to improve, and for quite some time.
Chris Brady of Teres Audio was over one night. The system was well warmed up and playing music before he got there. Even so, after a while he said, "It sounds even better now than when I got here." When the difference is big enough a guy who is unfamiliar with your system can hear it even playing different records you know its no small thing. The crazy part is even cold it sounds great to anyone who hasn't heard it before. So its not like it ever sounds bad. Its more like you said, night and day, and warmed up goes to eleven.
But back to the OP:
Do you season your components with opposing sounding powercords?
For instance, if your dac is neutral would you put a warmer sounding powercord on it? And if you have a warmer sounding amp would you put a leaner sounding powercord on that?
A lot do but I think its nuts. Think about it. The idea is to deliberately buy something with a known fault, to cover up something else with a known fault. So maybe the result sounds good. Fine I guess if that's all you ever do. But what happens when the day comes you upgrade the awful DAC for one that actually sounds good? After who knows how many things bought in the meantime, all trying to cover up the fault of the one bad DAC. Now look what you did- went and bought a great component that makes your whole system sound bad, because you made your whole system sound bad trying to cover up the worst bad one of them all.
Brilliant. No thanks.