Extruder could be to hot for the material used?
In the extruder tab the retraction distance seem a little high
Retraction Distance : 3.5
Retraction Vertical lift: 1.0
Retraction speed: 1200
in the Advanced tab
under Ooze Control Behavior
Check Minimum travel for retraction and set to a small number such as 3.0
if the travel is less than this then no retraction will occur.
and nothing else is check in the Ooze Control Behavior
Again if the temperature is set too high for the material stringing will be a problem.
also please see the help
https://www.simplify3d.com/support/prin ... -or-oozing