You're wasting your time releasing them. A spring has to be compressed beyond its yield strength to weaken, this is the reason you only compress them enough to get the trigger on. Cycling springs also reduces yield strength. It could weaken while compressed but it would have to be stored at extremely high temperatures (you would have to heat it).
Genuine regular stingers are made of great quality steel and I wouldn't worry about it. My two cents anyway.
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