You might not be getting any retraction at all. You can tell in the Cura layer view - blue lines are nonextruding and if there is retraction it shows a little vertical blue line at the start of the move - the head doesn't actually move up - this is just a graphical representation of "retraction". In expert settings, set "minimal extrusion before retracting" to 0. Even setting this to .01 will probably *not* give you retraction as you don't need much PLA for each of these small cylinders.
The hadron has the feeder on the print head so you don't need much retraction. I don't have experience with this type of printer but I know someone else who was happy with 1mm of retraction on a makerbot so I am wondering if 3mm is too much and it is drawing air into the nozzle which wrecks your control of extrusion because the air heats and expands and then much later you get air coming out (underextrusion).
Also try a different color of PLA as the tendency to string varies quite a bit.
Edit: added "*not*"
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illuminarti 18
No there isn't. But it should use the regular perimeter speed for those pieces. Can you show an example of where it doesn't?
Why do you think that a 'small perimeter' setting would be useful on this piece?
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