The fret one uses depends on which Imperial unit you measure in. For furlongs, it's fret 8, for feet it's fret 12, for pounds it's fret 14, and for ounces fret 16. I would advise avoiding fathoms at fret 6 and shillings at fret 20.
Personally, I also use the drop 'em till they buzz then go back up a little bit, after having set up the relief.