Might want to increase the temperature a bit, and play with the retraction. Leveling close is sometimes not good, because then the nozzle may scrap the part. Please let us know your temperature on the heated bed, and hotend. I think it should be fairly okay, but under extrusion or low temperature printing can also lead to clogs. In addition a good upgrade you can do is use an oiler, I have it on the Robo 3D and when I did not I would have issues, now I do not. It will help with less clogs too, if you mostly print in PLA.