What cartos did you use that you didn't like bc of constant refilling? I normally recommend the Boge 2.0ohm cartos for the ego bc they work really well. They only hold about 1ml though so you might likely like them. I use the Ressurector cartos and they work awesome but they are really made to be used on 3.7V PVs. The Ressurectors are 1.7ohm and hold alittle over 2ml of juice so they last a long time before needing a refill. They do work on eGos, but they don't run at full potential. Some eGo users still like them though, but they are 1.7ohm so they could kill your PV. My buddy killed his ego last weekend using one of my Ressurectors. Some use ago users have used them though and haven't had a prOblem. I wouldn't use them, but that's up to you. If you want something like them Hoosier Ecig Supply sells 2.0ohm XL cartos. They are the same size as the Ressurectors, but won't stress your PV as much. I'd use them instead.
The burnt taste is not because of the carto. It's because you either let them get too dry, or didn't fill them prOperly. The clearos could potentially do the same thing. All cartos have to be kept wet.
Your welcome to try the CE2s, but you said yOur looking for an easy to use carto. The CE2s are not the kind of carto that you can just fill and use. You basically have to mod them just to get them to work. Your welcome to try them tho. You might like them, but I hate them. That's why I like the Ressurectors bc you dont have to mess with them, just fill and vape away. I get avg 2-4 weeks with one Ressurector and they work great on my Epower so that's why they are all I use.
As for those tanks, i dont use that type of tank and because i sont really like them. I prefer carto tanks alot more and find they work alot better. Maybe try a tank like that.
I don't know a good clearo to recommend bc I don't use them, but someone else should be able to recommend a clearo if that's what you want to use. I prefer metal cartos bc I find they last longer and then you can use them in a carto tank too.
Every clearo I've used end uP either cracking or coming loose and leaking after a week or so of use. That's why I like the metal cartos bc they can take a beating