Measure your filament, you have it entered at 1.7 mm. Make sure your calipers are dialed in and zeroed out when closed. Don't apply too much pressure.
I also see you extrusion width (flow tweak) 1.1. This almost seems like you are compensating for your low filament diameter. Set this to 1.0 as a starting point.
Lastly you have the loop solid infill overlap set to 0.5. I typically keep this at 1.0.
I try to also do the perimeters a little smaller than the nozzle diameter, I have a 0.35mm nozzle and I typically dial this down to 0.32mm and then have the infill and support set to 0.4mm as I print them much faster than the perimeters.
Slic3r has settings to adjust the top finishes and states to reduce the nozzle diameter setting below what the nozzle actually is. I was skeptical but it actually worked in my case.
I typically dial in my settings for each filament type by printing a series a parts such as a thin walled part (~2 x nozzle diameter) and then a cube like you have. I measure the thin part wall thickness tolerances in many areas and then the overall size of the parts and then adjust my settings. I will have to do this about 5 or 6 times to get the settings dialed in to an acceptable level.