Royce, I have 1/16th piping on dead leg lubricators, but with short direct. route[about 1 " long ] for longer runs 1/8th " works ok, make the offtake from the lubricator removable and fit up with 1mm hole to start with, can always enlarge by small steps until youre happy with the feed rate..
Having said all that, working on an Aster Jumbo today and noted that the lub connection is 1/16th inch and goes up hill! at one point[ I dont believe this] and they all oil just fine. Gordon W