That's interesting. Those "recommended max" estimates tend to be super conservative. If you're worried stay away from EAS and MuscleMilk, but you should be doing that anyway because both of those are a huge ripoff.
FWIW, I get my WPC from TrueProtein, which you mentioned. No sweetener, just vanilla flavoring (you can customize it). Cheap as I've seen (although I haven't checked out CEL) and mixes very well. Might be chock-full of cadmium, for all I know, but it has been highly recommended by people I trust on this kind of thing (see signature). I wouldn't freak out too much.