Confirm for us then, you never originally had a leak, just a bulged rad hose which you replaced and everything started from there?? Was the bleeder screw removed when you changed the bulged rad hose to bleed the system? Did the bleeder screw have a brass or aluminum sealing washer on it?
No original leak. First leak was with the new Samco which stopped leaking once it was adjusted. Removed bleeder screw to bleed the system when I re-filled with coolant. I'm thinking brass washer, but uncertain. No leaks from anywhere until now.