The tests were made using a layer height of 3mm, 20% infill, no supports and the fastest speed possible. I did this for 2 reasons:
1) One of the main "symptoms" that the print is not receiving enough ventilation is curling and bending, which is more obvious to spot at this layer height
2) In order to make the tests as fast as possible and improve the design if necessary
The point wasn't to make the pieces look perfect, just to see if there was an improvement between them, which I accomplished.