So in this print, you can see what looks like to me - unevenness in the lines. I’m using the default generic PETG with kingroon petg black and the standard 0.20mm profile in creality print 6. Thanks in advance!
use the calibration tools in the slicer ( temp tower etc) to dial in the filament settings
you dont want that then first lower the temp a little to 235/240 no side fans. open the door and open top. then maybe a + 0,010 z-offset and maybe lower the flow to 98%. dry your petg if you dont already have done. try some above and you wil see wat work its not a realy long print you got there.
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Kris, as mentioned already I would never go with Generic filament profile anywhere!
@Martin_Prent made already several good suggestions.
The kingroon petg shows 215-245°C print temperature, I would set it for the first calibration test to 240. look at the spec sheets what else you need to change (for example lower cooling) and then run a calibration test part to see PA and flow rate.
The strange things is that on the amazon page they propose another temperature range of 210–230 °C and they propose 230 here as default.
Also the print speed: On Amazon they say 40-80mm/s which is only a max flow rate of ~7mm³/s and which is very low.
If you look for similar priced good high speed PETG then try Elegoo RAPID PETG (you also can use DEEPLEE which is the same as Elegoo), I have a max flow rate set there to 21mm³/s
My z-offset for PETG is 0.025mm for example.
PETG can be nice but not all vendors produce good quality! see here my recent test…
p.s.: If a part needs to be just nice and will not be used in hot or sunny place then use (matte) PLA!
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Thank you both for the feedback and knowledge. I had thought I had dialed it in, but then saw those results and start second-guessing myself (justified as it is). Below are the results after some more testing and parameter changes:
This is kingroon black petg (same as the OP image). Now my task is trying to dial in sunlu transparent petg 
Any tips?
Are those some sort of blob or voids on parts of that print? If it is, you might want to put the filament in a dryer for a while
If you’re talking about the little specs, those are from random seams as the seam option in the slicer but if you were referring to something else could you highlight it please?