@mikecoscia Thanks for reporting back! There’s a couple of threads here that reported poor surface quality after upgrading the firmware to 1.06. (This was the big release that supported automatic filament calibration, skipping objects, etc.) Released in tandem was Bambu Studio 1.7. Bambu Studio 1.7.1 made arachne walls the default and I think this is the real reason for poor top surface quality.
As it turns out, there were a lot of other problems with that arachne implementation, and they switched back to classic walls in Bambu Studio 1.7.3. Like @DzzD did, I also started avoiding arachne when I want the best quality print in lieu of speed. Although the sample size is small, I think this is the real cause of poor quality top surfaces.