Regarding loading a smoke unit, I think of laidoffsicks videos:
https://www.youtube.com/watch?v=WRcpFRtA6IY#t=180
https://www.youtube.com/watch?v=1asUWbJtfok
After initial load, my unverified rule of thumb is 1 drop of fluid for each minute of running with reloads after 10 minutes. In addition, I unboxed a LionChief Plus after being shelved for 1 year; got minimal smoke until I arrived at 45 drops in 10 drop increments.
Regarding my NIB 2010 Visionline Challenger I just got, I started off loading the units with 45 drops; it had already been loaded with an unknown amount by the previous owner when it was tested before shipment to me.
One last thing; I only load a smoke unit after it has cooled.