From reading others articles i'm quite certain my strings are too high at the nut. I've read recommendations of one business card thick. Mine is 4 cards or .035 with a feeler guage. I've adjusted nuts on my mandolin and guitar by removing the nut and carefully sanding the bottom of the nut so I don't mess with the top part. All my strings are the same distance from the fingerboard, so does this method make sense on a doublebass? Please let me know if this is not a good idea. Thanks!