Over-retraction is a common source of zits because it sucks air into the nozzle. You're using 5.5 mm which does seem rather a lot for a short bowden. I run a bowden printer and only use 4.5mm and get very good retractions. Also, I would have thought that coasting is going to make it worse.
The inner wall speed in your profile is very high. For good quality, I tend to use the same speed (and line width) for inner and outer walls so that the extruder pressure doesn't need to change. This can help reduce the bump at the z-seam.
It's generally worth enabling the wall print order optimization.
Hope this helps.
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Brilliant_Name 1
Here is the STL https://www.thingiverse.com/thing:3229413 and you can find the project file attached.
CE3_Test retraction -extra prime amount v1.3mf
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