I also have a CR-10 (and Ender-2, Anet A8 and CTC) and don't have those problems.
But I put my retraction to a specific location (especially on the calibration cube). Results are perfect. I also do retractions on the outer perimeter where the TO does not.
And especially on the CR-10 you should the increase the max E-Speed to 80mm/s instead of the default 25mm/s. Because of the slow extruder max speed the printer stays pretty long on the place where it retracts which causes blobs and they can push the outer perimeter out of alignment.,