When practicing droning slowly to a metronome, I noticed by listening very carefully that I often pluck by hitting the string juuuuust before following through actually playing the note. Instead of doing a clean swiping motion right through the string, I do kind of a slow bicycle movement which ends up catching my finger and throwing me slightly off time sometimes, so you can hear a light tap some milliseconds before the pluck. Kind of getting down into detail here, but which way is correct to pluck? Doing a clean swiping motion takes a lot more energy to do. I think you guys should try droning quarter notes at a low BPM and look for it.