Left/Rear and Right/Front Print Asymmetry with PETG

This is well-dried PETG printed on X1C using the external spool adapter with Bambu generic PETG settings. In each photo you can see that the upper half printed rougher than the lower half which looked near perfect. The dfiference I n quality is more visible in person. The upper worse half of the prints corresponds to the front - right side of the bed, closer to the door. The nicer lower half of the print was towards the back - left side of the bed. I am assuming this has something to do with the fans? Any advice? Thanks