Thank you for the guidance, Labern!
I performed atomic pulls until the filament looked clean and smooth. The exterior of my prints (specifically the bottom) looks much better now. However, the infill grid is still of very poor quality - as can be seen in these photos.
Is the next step to replace the PTFE coupler?
Progression of filament during atomic pulls:
Here you can see the correction of the bottom (fourth print is after the atomic pulls):
Here you can see the infill issue still remains:
Firstly I would do a few Atomic pulls to make sure there is nothing blocking the nozzle.
If it still prints bad after that it might be time for you to replace your PTFE coupler.
Some versions of cura have the infill set higher speed then the outer layers so you see under extrusion there first.
Looking at your green test block it looks as though it was printed to cold and the top bit that looks good is hotter due to less cooling time.
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