oh wow. Picture helps a lot. How big is this part in diameter? I'm thinking it's pretty small and the problem is it doesn't have enough time to cool. If it's smaller than 20mm in diameter then definitely try putting a rectangular "tower" on either side that is the same height or taller. While it prints the towers the fan will blow on this and it will have time to cool a little more.
Putting the towers to the left and right is good as the cooling fans are on either side of the nozzle in the print head.
Here is a photo of the part. As you can see, the lower part printed fine, but the upper is awful.
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