What is your shell thickness? In "spiralize" (joris mode) if you ask for a .8mm (for example) shell it overextrudes 2X so that you get a .8mm wall with a .4mm nozzle. This is difficult to do so you have to print slower. Also what is your layer height. .2mm is double the flow as .1mm.
Anyway I would try raising the temp to 240C if you are skipping steps. Or lowering the sped of course.
Here is a test you can do to see if your printer is "normal" or defective. You must do the test at 230C for the test to have meaning. Anything below 6mm^3/sec I would consider failing. 8^3mm/sec and faster is a pass:
http://umforum.ultimaker.com/index.php?/topic/4586-can-your-um2-printer-achieve-10mm3s-test-it-here/
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cleven 4
When did you acquire your printer?
Most likely the PTFE is worn. remove and inspect the ptfe spacer for wear.
acquire a new one if possible. Also possibly upgrade or change your feeder system.
many topics regarding this issue:
http://umforum.ultimaker.com/index.php?/topic/7024-teflon-spacer-replacement/
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