Here are the results from the file you sent :
Left is well under extruded(0.94) PA(k)=0.053 and external speed is 120mm/s / 255C print / Random seem
Right much better result is just a tiny under extruded (0.96), PA(k)=0.038, aligned seems 70mm/S/260C print
I almost never print PETG at the exact measured extrusion flow , my one is 0.99-1.00 and go up to 0.97 in rare cases using 0.98 most often 0.96-0.97
The second result is much nicer but for bets result in this case . should have used
probably PA(K) = 0.042 and the extrusion is probably ok , and may be the temp needs to be 255C . That is for my ESUN PETG
For all the settings i have uploaded 3MF file to makerworld but it strips the K factor custom command M900 K0.038; from filament settings which is used for Bambu studio to over write the PA(K ) in the filament settings
Please check and compare all Hex hole test by mindlessgreen - MakerWorld
Also note the cooling profile and speed profile
Let me know if you can not get the Print profile to copy Images of all the settings here
Also i tend to use seams 0% distance and wipe on , but even with 10%-5% distance and no wipe no problems in general just the way the seams look and model dependent
Left one using 10% seams no wipe random , right one uses 0% wipe on aligned
EDIT: some ringing/ghosting in the print - nothing to do with settings something to do with second printer on the same bench printing in parallel 
, but if it happens usually acceleration is high or the printer can not compensate well enough for unstable bench , or tensioners needs adjusting