I built the ssr-02 for -5v I followed your BOM, except the red led does not match your bom, it's just a clear red led... the opamp is the ad797. for DZ1 I used the bzx79-c6v8. I get -8.18 v out. Need to adjust closer to -5v.
You should have a LED at the DZ1 position.
Does it work now?