I think you will find all quality springs are double scragged during manufacture.

My springs are made at the same factory as a leading UK Airgun Tuner uses using the same specification wire & process, but different dimensions. That's good enough for me.
I know of some springs in rifles tuned during the late 80's still giving the same power as the original tune, having had many thousands of cycles, with just piston & breech seals needing replacing every few years.

So to me you fit the spring, get the power level you want & forget it.