'Bout this much works for me... for shatter glass anyway.
@Jman5280 put a tiny dab on top of the coils then slowly pulse the power until the wick gets saturated. You dont want to heat it enough that it starts to give off vapor but enough to liquefy the oil so it can soak into the wick.
After that, I load a chunk as seen above.
Also FWIW, I do a quick 2-3 second burn-off on brand new carts to clean the coils of any machining oils*.
*
This may or may not cause premature wear on your cart and I am not responsible for any damages occurring from following my directions.