I wonder if those who report clearos tasting "plasticky" are using a juice that leaches some of the tube? I started on cartos and clearos - CE5 style - and had no issues, except with one, which definitely did taste plasticky. Same clearo, different juice, not a problem. Same juice, different brand clearo, no problem either.
Some juices are known "tank breakers", and maybe that's the issue?
Not all tanks are equal.