I have spent more time than I care to admit shimming a board that turned out to be junk. My last build I bought 12 studs and 4 of them looked like bananas, so now I just stand them on end at the store and eyeball them first. My wife thinks I am weird for checking wood for ten minutes but she did not have to fight a rocking top for two weekends either.

Tracked mine for a whole month with a cheap temp and humidity gauge and yeah the swing is real. What surprised me was how much the beans themselves change, like I could hear them grind different in the morning versus later on. Are you weighing your dose every single time or going by volume in the basket? Because if it's volume, that humidity difference hits way harder than most people want to admit. Also wondering if you let the machine warm up the same amount both times or if the noon session gets a longer heat soak.