For replacement Springs, I always use Wolff Gun Springs, if possible.
https://www.gunsprings.com/EAA/cID1/mID19/dID100For the Recoil Spring, your Pistol will use the same Factory 14 lb Spring as the EAA Witness.
Trouble is, there are no reduced Power Recoil Springs listed, and if you are having trouble with weaker ammunition already, I can't see replacing
the Recoil Spring, if that is the case. Note that Cz75 Recoil Springs are a bit smaller in diameter and
will not fit the Tanfoglio Recoil Spring Guide Rod.
Your Pistol will use the older 2.5 inch long Tanfoglio/Witness/Cz75 Hammer Spring, which is also available from Wolff.
You can get a reduced power Hammer Spring, but I recommend using the Factory Standard Spring, to avoid light Hammer strikes.
Still, some enjoy the reduced DA Trigger pull a lighter Hammer Spring will provide.
Your Pistol will use the same Extractor Spring as any Cz75 variant and I recommend fitting an Extra Power Extractor Spring.
In the past, I've only had to clip one coil when fitting one.