Hi! I have a question and I hope some of you can clear this up for me! I know you fill your cartomizer before you put it on your pv. (I will be trying the condom method.) After you put it on your pv and start vaping are you supposed to add a few drops to the cartomizer after about every 10 inhales or can you just vape on it until the flavor lessens(is that how you can tell it needs a refill?) and then refill the whole cartomizer? Thank you in advance! 