I struggled with blobs on my print surface and did not matter what I tried, I could not get a smooth zitless surface.
Negative extra restart distance / Coast at end / Wipe Nozzle / Temperature / Force retraction between layers etc.- all with different mm testing. I could minimize it on some prints and sometimes had under extrusion problems on other prints due to a negative extra restart distance or one of the other settings. I was fighting blobs all the time.
This is on a direct drive extruder pumping 1.75mm filament into a original E3D V6.
With S3D V3 I checked the new retraction during wipe movements function, reset my extra restart distance to 0, Wipe distance = 5mm and suddenly all the cursing/swearing and struggling for months, came to an end.
I printed 11 different objects at about 35 hours and there are not even one blob or zit present on any of them.
