I've ordered two smileomizers (have only used pre-filled carts until now) and had a question I thought I'd ask while I wait for them to arrive. The directions on the smileo page look pretty straight forward...fill with 70-90 drops, one drop at a time, rotating the smileo as you go...rest 5 min and good to go. Then it says "Once you experience a lack of vapor production or flavor, it is time to refill the Smileomizer." I could swear I've read in the forums about people "topping off" or adding a few drops to their cartos as they vape to keep them from drying and/or burning them out. Do you have to do the same with the smileo's? What process do you all recommend? Please forgive if it is stupid question and many thanks for your help!