Switched to a 0.6mm nozzle (came from 0.4mm) with a Phaetus Rapido.
I've changed the nozzle size in the printer.cfg, orcaslicer, etc.
I calibrated my E-steps, pressure advance, Flow (EM), and all my little test cubes look good.
Material is PETG in a filament dryer, 270* and 60* bed.
I know I'm overlooking something here...