I'm pretty sure you simply need to enable retraction. It's a checkbox in basic settings.
Also keep in mind that the slower you print, the better the quality (although the rest of the surface looks pretty good). So 30mm/sec looks much better than 60mm/sec and 20mm/sec looks even better. This is a constant tradeoff between quality and speed.
But these strings I'm pretty sure will go away if you enable retraction.
was 'fix horrible' enabled in Cura?
I had a very similar problem with the stones from the egg project. After unchecking all boxes under 'fix horrible' everything was fine...
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