i think i notice better vapor, a stronger throat hit (even though same nicotine strength), and longer life when i use pre-filled cartomizers. is this just my imagination or is it that i am not filling my blank cartomizers with enough e-juice. to fill the blanks i use the condom method and put 15 drops into the blanks. is this too little and how will i know when i saturated the blank with e-juice.