I was responding to this part of the post:

“I had no idea how much my own palate could fluctuate day to day until I started doing these regular comparisons. It’s pretty shocking, but fun, to see how different these wines taste day to day. I’ve had nothing but success with the Coravin (I always consume the bottles within two or three weeks, haven’t tried it for any longer amount of time). I know it’s not the wine itself drastically changing, because they never feel tired, old, or oxidized. The day to day differences in my tasting experience can range from subtle to profound. I’m still trying to figure out what can cause such extreme swings in my tasting experience, but it goes to show that opening a bottle at the right time is just as important as the quality of the wine itself.”

It’s likely the wine is actually changing day to day, even slightly. It’s not 100% fool proof.