Hi all. OK I've been vaping on and off for about 2 years. Ive been using a istick. 30w with nautilus mini all this time and have been happy in doing so but lately I've wanted more so I brought a innokin apex sub with is good but I'm only getting about 20/30 puffs out of it and all the juice is gone, I understand that subs use more liquid but I'm thinking something maybe wrong only use on 22w at most. Can someone help me with this please