They are NOT third rate products.
They simply don't make a spring specifically for the CZ, and haven't gone to the trouble of making special ones, yet. But as the volume of CZ orders increase, I suspect we can eventually get CZ-specific springs available.
Nearly everyone participating here on the CZ-Forum, when they replace springs, use Wolff. We can't all be idiots.
We have found, however, that Browning HP springs are a better fit. (They're not functionally better - -just look better.)
Wolff makes the best springs available, and you will eventually move away from the factory springs, because they are inferior. Wolff is about the only alternative. (Many of the springs available from other sources, like Wilson Combat, are repackaged Wolff springs.)
It may be that you got an improperly packaged spring, and you might send it back to Wolff, explain the problem, and ask for a replacement.