Since yesterday I have found out from my favorite keyboard man Blacksimon that Jwk top housing is very thin , and this is why it produces a high pitched sound.
Personally, I've always had the opinion that JWK switches are not good value. Compared to Tealios, they are good, but you can get around 3 Gateron switches for 1 JWK. And they (Gateron) sound a lot better, and feel almost as good as JWK.