Anyone know what the most likely culprit for this PLA symptom is?

Anyone have any idea what might cause this sort of issue on PLA? I run into it frequently, but ONLY when all of the following points are true:

- the print has multiple parts, so the extruder spends a decent amount of time off of any given part (only one part from this print is pictured)

- the affected part(s), like the picture above, have a relatively steep outward overhang, extending over the build plate

- the outward overhang part is relatively narrow, as seen from a top view

The 4028 fan obviously has pretty massive airflow, so is it possible to have too MUCH cooling for PLA? Anyone ever had a similar problem and solved it without just turning the speed waaaayyyyyy down?
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