Stringing in Slic3r PE vs Cura 3.2.1  

Stringing in Slic3r PE vs Cura 3.2.1

So I assembled my new Prusa i3 MK3 a few days ago and have already done some printing. However, one thing I cannot seem to get right is the retraction settings.

No matter what retracion length/speed and travel speed I set there is always significant stringing. My other 3D printer (self-made machine) doesn't ooze at all with the same filament and an e3d v6/Titan Extruder combination.

So after some experimenting I found out that the slicer makes all the difference.

A print sliced with Slic3r Prusa Edition with retraction speed 40mm/s, retraction length 1.0mm, travel speed 250 mm/s shows significant stinging:

The same print, sliced with Cura, using the same settings, similar speeds, same layer height, same retraction settings, etc. yields much less stringing:

With Cura, just one tower has some stringing and other than that only the top layers are connected with small stringing lines.

I know that the filament is not the (PLA) but the question is what can I improve in slic3r to get the stringing performance of Cura?

I did a cross check with my old printer - the same model sliced with spic3r and cura and got the same results. So what can I improve in slic3r?

Thank you!