So it sounds like you're using a 3 piece ecig, with a battery, atomizer and poly filled cartridge. If you're not liking the taste of cartridge
juice, you're not alone
What some of us do is drip 3 - 4 drops of ejuice directly on the atomizer, which give 4 - 5 good hits. Then drip 3 - 4 more and continue. CAUTION, if you're using an automatic battery, that you draw on to activate, be careful not to drip too much
juice because if it gets inside the battery it will ruin it. You'll get the hang of when to add more juice as you get used to the flavors...when it gets low I can taste 'metallic' but YMMV.
Other than that, there are cartomizers and clearomizers which both take many drops of juice, ranging up to about 2ml max, and can last all day.
Then if you get really adventurous you can use a tank mod, which can hold 3, 5 or even 8ml of juice and last forever
HTH!