There is no such thing as a spring that will not take a set. To what degee the spring sets is the only question. Wolff are IMO the best gun springs made bar none and even they will take a set, but not much. I have not heard of anyone having a problem with their mags after replacing the crappy HK springs with the Wolff. Sometimes with new Wolff springs loading to full cap is hard but after they take their set they load fully and function perfectly. If yours are not check to make sure the spring is not in backwards. Believe me you would not be the first to do that. Also check to make sure you got the correct springs. Stuff happens and you could have gotten the wrong springs.
Why won't HK admit the problem and fix it? What, HK admit they "compromised" on mag springs??? ROFLMAO It'll never happen. I know it sucks but that is the way HK is.