I still like the CE2's better than anything else.
I actually like the older versions in metal more to be honest.
No leaks, no chance of the tube sliding of in my pocket, cone fits over them. Subsequent revisions seems to always add some new issue. Clear ones, the tubes cracked and leaked; ce3 with the unbreakable tubes, pull the center post out too easily when disassembling.
I haven't tried the CE4 yet, its a bit on the expensive side and these larger tubes always crack on me. I'm sure though you still have to rinse and dry burn each one before first use though. That's likely the crap taste you're getting.
The only other reason is if you pinch the wick too much with the inner seal you'll get dry hits.
When they're working, they give the best vape IMO.