OK, I've hesitated writing this as I don't want to put the newbies off, but this is my experience and I hope it may help you, as you seem to be in the same boat I was.
I started with a ecigalike, worked greatish for a couple of weeks, then progressed to cartos and a riva, worked great for weeks, then I found I was always filling up the cartos and they always seemed to taste bad after a while.
Then cart tanks, brilliant........... fail, leaking, lost juice x 10.
Then vivis, brilliant for a short time, then bad taste. Change head, the same.
I went through loads of different stuff, almost gave up, then I found the pheonix and tried it with the fibre wick and don't you know it, brilliant for a while, then crap after that.
Then I tried the pheonix with the SS wick and it was great and it stayed great, but I have to change my coil every 3 or 4 days, otherwise the taste goes.
Looking at the mess on the coil after 2 or 3 days, I can believe how the fibre wick couldn't take it. No surprise to me that the taste went on the vivi's after a couple or few days, it's totally clogged up! It's a mess, how any taste can get through that is crazy. And the same with any fibre wicked stuff, cartos, the lot.
I've always said, (sometimes with displeasure, as everyone else seemed to be enjoying the things I hate) that I seem to have a heightened sense of taste.
But I do know what I know and nothing has come close to what I have now... Well it does, but only for a short time.
If you are as afflicted as me and have a hrightened sense of taste, I advise you to use SS wicks and change your coils often.
Cleaning the coils through burning didn't work much for me either, even on the SS mesh wicks, 75% of the time it left a terrible taste.
Changing the coil seems the only way.
You're probably not like me and I've just made myself out to be a flavour snob