I get my lines character count, tab to center (or -10, -20 tab) then backspace to the right count. If I think it’ll make it look cleaner I sometimes mix a double space in or ignore punctuation marks from my count, I don’t mind them hanging past the rest like I would an M.
PS I thought I remembered messing it up right after I started and sure enough if you look at line three of that picture it’s pretty out there lol