Any 700 series controller will have the forced S0 issue with older devices - it's per SiLabs spec unfortunately.
There is a lot to unpack here.. what devices are you using? Are they in the list of compatible devices? Using any community apps drivers?
- I would first try and remove any ghosts to make sure your mesh is as clean as possible. Recommended is trying the HE way via Z-Wave settings or the PCS way.
- Exclude and Factory Reset each device.
- After you pair the Z-Stick with HE you should be able to walk around and pair each device then plug it back into your PC and run the PC Controller sw. Disclaimer: I have not done this in a very long time so ymmv.
Also keep in mind that some devices like locks require S0. I have a ZW+ Fibaro keyfob that I cannot get working properly even after many attempts at pairing via the PCS route with both a Z-Stick and UZB-7.
As @MarkG mentions you might consider checking out HomeAssistant and use that Z-Stick for the controller. If you have some technical chops it should be relatively straightforward (until it's not!) - you'll need a server machine or vm to dedicate to the process. You could then share those devices with HE to make a cohesive system via the HA community bridge.