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Yeah, you could drill it out or you can calibrate your printer a bit more.
If I remember Neil Underwood's youtube channel has a video on calibrating X,Y & Z E=Steps.
https://www.youtube.com/watch?v=wAL9d7FgInk

Also ZennmasterM's youtube channel has a couple of videos on tuning your E-steps and extruder.
https://www.youtube.com/playlist?list=PLU2kePyB_WAanJvtjJGZI7l0GjY7uQJHo