It's a head-scratcher for sure. Another weird effect is that different colors from the same brand also provide different results. As you know, every design/filament requires its own profile. Moisture is a big problem for most PLA. In the past years, I've gotten in the habit of keeping my filaments in a bin with a sealed lid and a rechargeable dehumidifier. I'm also using a filament dryer for long prints. As far as printing the lather bowl, I set the heat-bed at 40c to reduce the high heat thermo-layer which affects the high over-hang at the start, and set cooling to 100% for the first 5mm. After that, cooling comes down to 60% for the rest of the print. The slower the print, the better the results.