A stronger recoil spring (depending on its strength) can be harmful. Recoil springs don't do much to "protect" the gun as the slide goes back, but do cause the slide to slam forward with extra force as the slide returns to battery.
If you're having to chase brass, and you reload, a stronger recoil spring may be useful -- otherwise, the 14 lb spring (or even less) will work fine in a standard (full size) 9mm CZ.
As others have suggested, however, check with Angus or someone at his shop. He's forgotten more about CZ than most of us will ever know, and still knows more than we do.
(Note: the BHP springs from Wolff are closer to factory CZ springs than are the Wolff springs for the CZ [which are REALLY for the Witness line, and have a larger coil diameter]. The BHP springs are physically the same as the factorey CZ springs, if you get the same weight. The standard BHP spring, however, is 18 lb., and you'll have to get one of the lighter Wolff BHP springs when using one in the CZ; last time I looked, their lightest spring for the BHP was 14 lbs. They do offer a variable rate spring 14 lb. spring, which I'll get the next time I need one.)
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