Have both the setups you mention and the 75 CZC SA just has a slightly better trigger pull. The Kadet 2 can make mine shoot like my S&W 41 of old. With the right ammo will shoot X ring on a Bullseye target at 25yds all day long. The newer kits for Shadow 2, P-07 and SP-01 just do not seem to have the same level of accuracy. Granted they will and do shoot 10 ring at 25yds on full size silhouette.
Granted this is just my experience.
Best wishes on your project.
JW