My CZ barely moves when I pull the hammer back and release.
That's interesting. Just for giggles...cycle the slide and ease it forward. Watch to see how far the hammer moves as the slide goes into battery.
The hammer hooks/full cock notch can only be so "beefy." The width of the hammer is one limiting factor, and the longer they are, the further the sear has to move to release the hammer. Long=Creep. The hook surface to sear crown interface is narrow. Otherwise, the trigger action will require a bit of effort.
Designed to operate under friction...not impact.