This time I pre-heated the fingerboard and the neck. I am using hide glue. I think that one of the cause of the joint failure was premature gelling of the glue.
Since the radius was already made I ordered straps from Stewart Macdonalds.
I had to fix the rabbet that was smudged with the glue. This time, I glued the bindings using thick cyanoacrylate glue. It went much faster and hand pressure was enough. I wore gloves... The result is releiving considering how bad the situation looked before!